A simple adaptation to convert commercial automatic titrators to

daptation to Convert Commercial Automatic Titrators to Automatic Microtitrators ark L. Lyndrupl Department of Chemistry, Northwestern University, Evansfon, Ill. IN STUDIES of certain polymeric acids and bases, it became necessary to obtain titration curves for milligram portions of fractionated material. Commercially available automatic titrators could not be used as the volume of titrant necessary to obtain full chart recording was at least 0.5 ml. Thus a solution volume of 50 ml would be required t o keep dilution of the polymer to less than 1Z during a titration. By a simple adaptation of a Radiometer Titragraph TTT-1 automatic titrator, we were able easily-and reproducibly -to carry out titrations in a total volume of less than 0.3 ml. EXPERIMENTAL

A diagram of the titration cell is shown in Figure 1. The double-walled borosilicate glass cell was thermostated to A0.01 O G. A calibrated pipet was used to deliver a portion of the sample solution to be titrated into the cell. Nitrogen, freed from COZ,was then bubbled through the solution for 5 minutes through the 22-gauge Teflon needle. The needle was then raised until it was about 5 mm above the surface of the liquid, and the Sargent combination electrode was lowered into the solution until the platinum pin was completely immersed. The titrant delivery tube was then placed in the solution so the tip was within 0.5 mm of the glass bulb of the electrode, and the titrator was started. The electrode was connected to the titrator by means of a Beckman electrode adapter obtained from Radiometer. 1

Figure 2.

Diagram of drive assembly for microtitrator

A. Flexible output shaft from titrator B. 12-tooth gear C. 36-tooth gear D . 12-tooth spindle gear E. 72-tooth gear cemented to shaft of Spinco microtitrator with epoxy resin

Present address, Physical Chemistry Institute, Uppsala, Sweden. The adapter to the titrator is shown in Figure 2. The output from the titrator (flexible drive cable) is normally geared so that when the Radiometer microburet syringe is used, 50 revolutions of the cable give full chart recording (100 graph divisions). The output cable was connected to a gear reduction box which reduced the output by a factor of 18. The final gear in the box was joined, by epoxy cement, to the handle of the micrometer of the Spinco No. 153 microtitrator. A reduction of 18 gave a full scale recording for 2.778 revolutions of the micrometer (5.555 microliters of titrant). Concentrated solutions of C02-free NaOH or HCI were used as the titrant and were prepared by standard methods. RESULTS

With this apparatus, it was possible to determine the acidity constants of acids or bases, either of high or low molecular weight, with less than a milligram of sample per titration. The pK’s could be established within 1 0 . 0 2 pH unit by direct reading from the titration curve on the recorder or to within kO.01 pH unit if the data were fitted to the Henderson-Hasselbach equation. ACKNOWLEDGMENT

Figure 1. Diagram of microtitration vessel for microtitrator Borosilicate glass titrator cell Polyethylene delivery tube from Spinco microtitrator C. Spinco microtitrator D. Hamilton 22-gauge Teflon needle for delivery of COz-free NZ over swrface E. Sargent Combination electrode F. Magnetic stirrer G. Magnet encased in polyethylene €or stirring A.

3.

1680

a

ANALYTICAL CHEMISTRY

The author thanks Irving M. Klotz for helpful encouragement and support. RECEIVED for review May 4, 1967. Accepted July 10, 1967. Work based on a thesis submitted in partial fulfillment of the requirements for the Ph.D. degree. Investigation assisted by a grant (GM-09280) from the National Institute of General Medical Sciences, u. s. Public Health Service.

If

announces a new micro model CARBON-HYDROGEN ANALYZER TYPE

NEW LITERATURE FROM METTLER

Determine Meltin and Boiling Points o mat i ca II y A new bulletin describes the Mettler FP-I, an automated instrument for rapid determination of melting points and boiling points over the range of - 20' to +300' C, with ' precision as great as 10.1C. Through electronic sensing of endpoints, the instrument makes completely objective determinations without the operator's constant attention. Three tests can be performed at one time with data in all-digital form. Request Bulletin FP-I from Mettler Instrument Corporation, 2 0 Nassau Street, Princeton, New Jersey O S 5 4 0 .

Circle No. 75

on

Readers' Service Card

See AGS Laboratory Guide for All P r o d u e W a l e s Office

Combines rapid, programmed combustion with conventional gravimetric procedure. Takes solid and liquid samples in 1-20 mg range. Easily permits analysis of 30-40 samples within a n %hour working day. Samples, sealed in combustion-accelerating aluminum capsules, are burned in oxygen a t 900°C. Combustion is complete in one minute; a 3-minute oxygen sweep follows. Carbon dioxide and water are collected and weighed in absorption tubes filled with Ascarite and Dehydrite. Specially designed circular slide rule speeds calculation of results. Applicable to analysis of a wide variety of materials, including those containing boron, fluorine, phosphorus, silicon and metals. Provision is made to prevent interference from halogens, sulfur, and nitrogen.

I3 n o o n

6445-W05. Micro Carbon-Hydrogen Analyzer, Thomas. Complete with supply of absorption tubes, sample capsules, absorbents, materials for packing combustion tube, calculator, etc. For 115 volts, 60 cycles, a.c.. . . . . . . . . . . . . . . . 1,950.00 6446-KIO. Calculator, Carbon-Hydrogen, Thomas. A circular slide rule to convert weighing results to %C or %H. Applicable generally to gravimetric C-H methods ....................... 18.00

FIRST CLASS Permit No. 1538 I

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~

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ARTHUR H. THOMAS CO. ScientiJic Apparatus

VOL. 39, NO. 13, NOVEMBER 1967

I

N O POSTAGE STAMP NECESSARY IF MAILED IN THE UNITED STATES

Detailed information upon request.

Circle No. 39

New York, N. Y.

.-La

I

10022

-

= -

New speed and convenience in analysis of alkali metals using the simple, dependable Coleman Flame Photometer! Sodium, potassium, calcium, up to 1000 lithium, magnesium analyses per day-completed by a single operator.

.

Orion Research Incorporated

e

I

11 Blackstone Street Cambridge, Massachusetts 02139

Permit No. 1538

New York, N. Y.

N O POSTAGE STAMP

NEGSSARY IF MAILED

IN THE UNITED STATES

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-

I I

&.bl

POSTAGE WILL BE PAID

1111

s l

I I

I I I

ICAL CHEMISTRY !E3

I I

111

111

430 Park Avenue

I I I I

=

I I

New York, N. Y.

10022

I I I I

These rates are achieved with no loss of analytical accuracy-the Coleman Flame Photometer maintains routine accuracy within 1% constituent concentration for most analytical procedures. Already dominating the fieId of clinical flame analysis, the instrument is daily proving its versatility In analysis of industrial materials-pharmaceuticals, fertilizer, soils, foods and many others. The ColemanFlamePhotometerneeds no acetylene tanks, water connections, compressors, drains or special venting. It Is as safe as an ordinary bunsen burner. Writef o r bulletin A-298A or ask YOUP apparatus dealer f o r a demonstration.

COLEMAN INSTRUMENTS MAVWOOD, I L L I N O I S 60153

A Division of T h e Perkin-Elmer Corporation

Circle No. 35 an Readers' Service Card

140 A


Any gas chromatograph

connects to Sargent's SR/GC recorder

for fast, sensitive recording.

..

-second shot in He was in Michigan for a holiday. He dropped in for a visit since he buys spectrographic electrodes from us. As always, we were happy to show him around Ultra Carbon and talk about his operations and problems. When he happened to mention he was using a 140-second exposure in his analysis for lead, we suggested the custom designed electrode shown above. Now, he needs only 70 seconds for his shot. Profitable visit.

For more than 21 years Ultra Carbon has been helping the

LCARBO b

Circle

142 A

professional spectroscopist do a better job. First with improved purity. Then with stocked preforms. Next through precision machining. And always with personal interest and attention to your problems and needs. If you happen to be in Michigan, drop in. The welcome mat is always out. Or, write Box 747, Bay City, Michigan 48706.

No. 100 on Readers' Service Card e


See ACS Laboratory Guide f o r All Products/Sales Office

EQUIPMENT APPARATUS INSTRUMENTS SMA 12/60, sequential multiple analysis system, 12 channels, 60 samples per hour, can p e r f o r m a n y 12 of t h e following clinical c h e m istry tests on blood serum: SGOT, alkaline phosphatase, LDH (minus blank), bilirubin (minus blank), uric acid, urea nitrogen, sodium, potassium, chloriae, carbon dioxide, cab cium, inorganic phosphate, total protein (minus blank), albumin (minus blank), glucose, cholesterol, and creatinine. Improvements of t h e SMA 12/60, over the SMA-12, in addition t o the faster testing rate, include plug-in interchangeable analytical cartridges which can be removed or substituted for other tests, without disturbing the functions of those remaining. Only 2.0 ml of untreated serum is needed; t i m e f r o m aspiration of a given sample t o a finished serum chemistry graph is only 9 minutes. Finally t h e new AutoAnalyzer system uses only 1/6th t h e a m o u n t of reagents as the previous S M A- 1 2 . T e c h n i c o n C o r p o r a t i o n , Ardsley, N.Y. 40 1

Basic t o a new automated laboratory testing system is t h e IBM System/360 Model 30 (left). Used in conjunction with a n I B M 1080 data acquisition system (right), equipped with a carousel type blood sampling unit, the system provides doctors with fast results of laboratory tests. The data acquisition system may be connected t o either fully automated or manually operated laboratory instruments t o simultaneously p e r f o r m many different tests o n a single blood sample-up t o 60 samples per hour. As the blood is tested by various laboratory instruments, t h e results are plotted on a graph for visual inspection and at the same t i m e results are transmitted electronically t o t h e IBM 360. Keys t o the system are accuracy of sample identification, con-

version of electronic laboratory i n s t r u m e n t signals into computer language, and speed of computer analysis. The computer, in addition t o preparing the patient’s final laboratory report, also is a watchdog i n comparing all measured results against quality control standards t o detect changes in i n s t r u m e n t test conditions. Daily patient reports can be supplied including information on changes in the patient’s condition, indications of the significance of these changes, and highlighting of the need for further action. This system has been developed at The Youngstown Hospital Association, Gypsy Lane a t Goleta, Youngstown, Ohio 44501, and was announced by Dr. A.E. Rappoport, pathologist and director of laboratories at the hospital association. 402 VOL. 39, NO. 13, NOVEMBER 1967

143 A

EQUIPMENT APPARATUS INSTRUMENTS

Optical emission spectrometer offers a selection of measuring consoles permitting short version programming for 4, 8, 12, or 16 elements, but two standard (vacuum and air) versions are equipped t o determine u p t o 2 0 and 2 4 elements. The consoles can be extended t o 24, 28, 32, 36, 40, and 48 elements. Intensities of spectral lines measured through photomultiplier tubes and amplified result in voltmeter

readings made directly. The output can be connected to an electric typewriter or a potentiometric recorder can be added for profiling. According t o the maker, the instrument offers increased precision of photoelectric measurements over that offered by photographic methods i n addition t o increased speed (23 elements in 2 minutes). Philips Electronic Instruments, 7 5 0 South Fulton Ave., M o u n t Vernon, N.Y. 10550. 403

miNiMaR, 60 M Hz nuclear magnetic resonance spectrometer for routine proton analysis of organic structure and analytical investigations, is designed for ease of operation. The instrument permits use of sample temperatures f r o m -50" t o +loo" C. The standard magnetic field is 14,092 gauss; resolution is better t h a n 1 X (0.5 Hz); resolution stability is 0.6 Hz per day; spectra reproducibility is 0.5 Hz (five successive 300-second scans); long t e r m stability is better t h a n 2 Hz/ 16 hours. J E O L C O ( U . S . A . ) , I n c . , 4 7 7 R i v e r s i d e A v e . , Medford, Mass. 02155.

404 144


NEW PRODUCTS

SAGE INFUSION PUMP OFFERS

A range of 5 million to 1 rn Reproducibility of -t.0.5%

Three models of the 255 Series provide flow rates of:

Sage Series 255 syringe pumps let you dial the precise flow rate you want. These versatile pumps offer a flow rate range i n excess of five m i l l i o n t o one, and infuse fluids accurately, reproducibly, and with complete reliability. Flow rates are unaffected by changes i n back pressure or variations i n line voltage (within specifications).

Moder255.1 Model 255.2 Model 255.3

--0.005 pllrnin to 29 rnl/min 0.02 PI/ hr to 98 - 0.02 pl/day to 118 rnl/day rnl/hr

Models offering fixed flow rates as well as continuously variable rates are available. Infusion/withdrawal models and accessories f o r two channel pumping can also be supplied. Send for complete technical data or ask your Sage lab-ware dealer. Series 255 $395.00 (other models from $145.00)

SAGE INSTRUMENTS, l N C a 2 Spring Street, White Plains, Circle

Vacuum Electrobalance system shown is designed for researchers in the fields of gravimetric thermoanalysis, adsorption, and surface chemistry. Modular units can be used as needed; the system can be tailored t o meet individual needs. Basis of the system are the RG and RH Electrobalances, with their capacities of 2.5 and 100 g, respectively. The furnace is 1-inch i.d. and is rated for 1200" C for continuous operation. Cahn Instrument Co., 7500 Jefferson St., Paramount, Calif. 90723. 405

Organic Carbon Analyzer The Model 915 total organic carbon analyzer, TOC, uses high- and low-temperature furnaces and quickly determines both total carbon and total inorganic carbon content in water samples. Analysis time varies from 2 t o 4 minutes : analysis ranges available are from 0-50 u p to 0-4000 mg organic carbon per liter of sample. The three-part unit consists of a TOC analysis unit with furnaces, an IR-215A infrared analyzer, and a 10-inch potentiometric stripchart recorder. Beckman Instruments, Inc., 2500 Harbor Blvd., Fullerton, Calif. 92634. 406

N. Y. 10601

0

914 WH 9-4121

No. 89 on Readers' Service Card

ACCURATE, CONSTANT light intensity with NEW Series Envir a-lit e" Cabinets Designed for accelerated aging of samples and specimens under controlled light conditions, the Envira-lite offers the widest range of features available. Light intensities are uniform throughout the entire test shelf, can be varied manually through a range from 90-3000 footcandles. The interior surface of the cabinet is a special highly reflective finish assuring even distribution of light on all test sample surfaces, A laminar flow of filtered air uniformly removes lamp heat through specially constructed ceiling and floor. Bench and floor cabinets are tamperproof, doors and all controls can be locked. F R E E , . , S E N D TODAY for TRI Fact File of technical information.

THERMAL RESEARCH, INC. THERMAL ROAD, ISELIN, NEW JERSEY 08830

*

TEL. (201) 549.1800

Circle No. 96 on Readers' Service Card VOL. 39, NO. 13, NOVEMBER 1 9 6 7

m

145 A

NEW PRODUCTS

All

Thsrmobalance

I

Scott Research Gas Mixtures Have a Gnaranteed Analysis in other words our gases are sfandard gases Your verification of the analysis is eliminated, thus saving time and money. Scott Research gas mixtures are made to order in cylinders containing 1 0 to 200 cubic feet, 1 to 20 trace or minor components in parts per billion to percent concentrations. The “make” tolerance is and analysis accuracies vary from i5% to 1%of each trace cornponent value depending on your requirements. We purify many gases for special applications, including use as zero gases and as major components of calibration standards. Our pure air with total hydrocarbon content less than 0.1 ppm carbon is an example. At Scott Research we have the necessary experience to help you. For further information, call or write. Remember-all Scott Research gas mixtures, complicated or simple, have a guaranteed analysis.

SCOTT RESEARCH LABORATORIES, INC. (215) 249-3526 P.O. Bpx 66, Dept. D, Perkasie, Penna. 18944 Circle NO. 167 on Readers’ Servica Card

146 A

0


i

differeiltial transformer

oeneratorL-’

-

recorder

Automatic thermobalance Model TR160A has a capacity of 1 6 0 grams and will record mass changes of 0.1 mg. The unit is available with a vacuum system which provides l o 4 m m Hg; standard maximum temperature is 1000° C; higher t e m p e r a t u r e models can also be supplied. Changes in both mass and temperature are recorded simultaneously on a chart. The programmer for the temperature control is variable from 0.5 to 58 hours. Voland Corp., 2 7 Centre Ave., New Rochelle, N. Y.

10802.

eleket

medical X-ray equipment and services

407

Direct Reading Spectrometer The Model 66-004 1.5-meter btomcounter is a direct reading spectrometer x i t h program flexibility. A typical instrument may have provisions for installation of as many as 60 analytical channels; the Atomcounter is provided with a selector switch which makes possible the routine analysis of up to five different groups of elements. This can be expanded if necessary by an additional matrix ,selector switch. For unusual problems requiring photographic analysis, the Model 78-000 Wadsworth spectrograph may be used in conjunction with the Atomcounter. A vacuum attachment is available and a variety of readout systems may be used. The grating is 30,000 gpi: dispersion is 5.45/mm (first order; 2.7 A/mm (second order). Resolution is better than 0.2 A. Wavelength range is 2000-8000 A (1670-8000 A with vacuum accessory). Analysis time is less than two minutes. Jarrell-Ash Co., 580 Lincoln St., Raltham, Mass. 02154. 408

Tracerlab

nuclear equipment for research and industrial control

lectronics

aerospace systems and electronic products

matic Signal electronic traffic control systems

Cyanide Ion Activity Electrode

A new chemical sensing device measures cyanide ion down to 10-BM, 25 ppb, a t temperatures from 0’ to looo C. The company claims the electrode is free of interferences by most common anions including chloride, nitrate, sulfate, fluoride, and perchlorate. Orion Research, Inc., 11 Blackstone St., Cambridge, Mass. 02139. 409

LABORATORY FOR ELECTRONICS, BOSTON, MASS. Circle No. 140 on Readers’ Service card

NEW PRODUCTS

portable miners

Electroanalytical instruments above are: function generator, Model GSTP-2, top, which has a function frequency range 0.001 to 10 kHz, output 210 volts; offset voltage i-10 volts, adjustable with 10.turn potentiometer. The fast rise potentiostat Model PIT 20-2A, bottom, is one of three series of Tacussel potentiostats available. The instruments can be operated as controlfed potential generators, controlled current generators, or controlled voltage generators. Re. sponse time of the PIT 20-2A is 0.2 t o 0.5 p e c . ; the PRT Series of instruments have a minimum response time of 2 to 7 p e c ; and the ASA Series, 2 to 3 msec. Further information on these instruments is available from Numec Instruments and Controls Corp., 300 Seco Rd., Monroeville, Pa. 410 15146.

now comes t o you from Eastern The shape of things t o come in portable mixers for industry is exemplified today by this new Eastern mixer series. 0 Much more rugged: Heavy-duty outboard bearing carries radio mixer shaft load single reduction internal gears for greater strength, longer life and quieter operation. 0 Much more flexibile: Standard Nema selection of direct drive o r Frame Motors gear reduction choice of agitator assemblies. 0 Much more versatile: Special coupling assures positive drive and quick shaft removal adjustable ratchet type swivel clamp for mixer positioning. 6 Send for the new Series 500 Bulletin.

...

. .. ...

.. .

SEE THIS NEW MIXER AT THE CHEM SHOW

€4

EASTERN INDUSTRIES A Division of Laboratory For Electronics. Inc. 100 Skiff Street, Harndsn, Connecticut 06514

Circle NO. 129 on Readers’ Service Card

Laboratory Calculator -4n advanced electronic printing calculator that can be operator-progranimed t o as many as 42 steps has been introduced. To program, the operator presses the “LEARN” key and goes through a calculation once. Thereafter, the EPIC 3000 performs the routine automatically as variables are entered, printing out the results on paper tape. Also featured with this calculator are completely automatic decimal and zero placement and a single key for obtaining square root instantly. Litton Industries, Inc., Monroe International Division, 560 Central Ave., Orange,

IT.J.

41 1

Chloride titrator is available in two models. One gives a direct milli. equivalent readout on 0.05-ml Samples. Both instruments have an automatic blank-subtract timer (a direct milliequivalent readout timer) and a second timer which allows the use of the instrument on samples having a much wider range of concentrations than is normal in clinical chemistry. Operation of the instrument is coulometric with an amperometric end point. A pair each of silver-generated and current-measuring electrodes are used. American Instrument Inc., 8030 Georgia Ave., Silver Spring, Md. 20910. 412

X-Y Recorder A new “function/riter” recorder can be mounted vertically or horizontally, or, if used as a tabletop unit, may be angled to 45 or 90° from the horizontal. Both 81/2 X 11 inch and 11 X 17 inch charts can be used, Either X or Y axes may be geared t o time function, while the interchangeable function modules permit quick and easy modification for various uses. Three modules are now avaiIable: a single range signal input module, a time-sweep/signal attenuator module, and a multirange attenuator module. Texas Instruments, Inc., 3609 Buffalo Speedway, Houston, Texas. 413

Chromatography Columns Wright chromatography columns made of polymethylmethacrylate with polyethylene and nylon end pieces come in a wide variety of sizes with bed volumes from 10 ml to almost 1500 ml. The columns may be supplied as fixed capacity or adjustable capacity, either with or without water jackets. Gallard-Schlesinger Chemical Llfg. Corp., 584 Rlineola Ave., Carle ’Place, L. I., N. Y. 11514. 414

VOL. 39,

NO. 13, NOVEMBER 1967

147 A

NEW PRODUCTS

AIR POLLUTION WITH PLANETARY GEAR H€AD MOTOR*

used slngly o r In banks Anti-skld pad on top

surface

MICRO V TEST TUBE

SUPPORT RACKS. You can now magnetically stir in test tubes. Racks are designed t o fit snugly on top of the MICRO V. For tubes up t o 25 m m dia.

6"x 6" MAGNETIC STIRRER *Solid state speed trol - 50 t o 1700 RPM range Exclusive dual Alnico-V maonet desian Drevents "wanderina" or "spin-out" of' any size bar at top speed. Stirrer top 6%'' square, body 37/" high.

9"x 9" MAGNETIC STIRRER Large 93/" square surface easily accommodates up t o 10.gal. carboys. Utmost efficiency insured by solid state speed control and 3A Ib. dual A1nico.V magnet assembly for driving any size stirring bar. Convenient "Load.Mode" switch provi,des maximum speed resolution for broad range of load conditions.

MAGNETIC STIRRING BARS Newly designed, with more powerful magnets. Completely seamless, no leaks, weak spots or other failures found in conventional bars. Eight sizes, ranging from 7 mm long, 2 mm dia. t o 21/," long, "3: dia.

Universal data readout system collects digital information from a number of dissimilar sources and routes it t o one or more common readout units. The system is designed t o eliminate problems of input/output incompatibility between f unct iona Ily different instruments. Consisting of a master control unit, a power panel, and as. sembly control for each group of related instruments, interface modules, counters, etc., the system can be ex. panded to accommodate additional data accumulating and readout devices as needed. Output may be recorded in typewritten, punched papsr tape, magnetic tape, and/or printed format; reading can be from punched or magnetic tape if needed. Technical Measurement Corp., 441 Washington Ave., North Haven, Conn. 06473.

415

Labora)ory Mass Spectrometer The QLAD 160 is a compact, mobile laboratory mass spectronieter with linear mass resolution from 1 t o 250 amu. Of quadrupole design, the instrument sweeps the entire mass range, 10-250 amu (optional 1-150 a m u ) , or any portion of this range in 100 milliseconds to 10 minutes. Other features of the mass spectrometer include emission regulation, variable automatic or manual mass scan, and a mass marker/emission meter. resolution is better than one, using the 10% valley definition for resolution The single console which houses the mass spectrometer and aqsociated vacuum equipment measures 27" x 39" X 41". Electronic Associates, Inc., 4151 XIiddlefield Rd., Palo Alto, Calif. 94303. 41 6

Surface Tension Meter On-stream surface tension can be measured, recorded, and controlled, continuously and automatically, with a new process surface tension meter. The measurement can be made a t any pressure from yacuum u p to 750 psi. Surface tension is measured by the T i l helmy method. The meter is based on the use of the Cahn RG Electrobalance. Cahn Instrument Co., 7500 Jefferson 417 St., Paramount, Calif. 90723.

Circle No. 38 on Readers' Service Card

148 A

0


Harleco offers its Air Pollution Reagents in accordance with Selected Methods for the Measurement of Air Pollutants; U.S. Department of Health, Education & Welfare; Public Health Service. Quality, reliability, a n d uniformity are the important requirements when choosing Air Pollution Reagents. By using Harleco, test results from various locations can be accurately compared t o each other with the assurance that Harleco reagents are uniformly m a n u factured on a batch-to-batch basis. This consistency i n our manufacturing operation has made Harleco t h e leader in its field for over 4 decades. Procedures include: Sulfur Dioxide-West & Gaeke; Sulfur Dioxide-West & Gaeke Automated; Sulfur Dioxide-Hydrogen Peroxide; Nitrogen Dioxide and Nitric Oxide-Saltzman; Nitrogen Dioxide and N it ric Oxid e-Au to m a t e d ; Oxidants Determination-Neutral Buffered Potassium Iodide; Oxidants Determination-Automated; Oxidants Determination-Alkaline Potassium lodide; Aliphatic AldehydesMBTH; Aliphatic AldehydesAutomated ; Ac role in-4 Hexy I resorcinol; FormaldehydeChromotropic Acid; Sulfate in Suspended Part ides- Ba ri u m Sulfate. Also available i s the CAMP (Continuous Air Monitoring Project) reagents supplied i n Stable DRY-PACK@ form.

-

Write directly t o Harleco, 60th and Woodland Avenue, Philadelphia, Pa. 19143, Specifying the "Air Pollution Reagents" Publication No. 633

Circle No. 138 on Readers' Service Card See ACS Laboratory Guide for A l l Products/Sales Office

NEW PRODUCTS

Solid-state controlled, all stainless steel constant temperature circulator is capable of control to i0.004" C and operates between -60" to $250" C. A fully stepless heater out. put (0 to 1000 watts) permits control of circulated liquids through viscometers, spectrophotometers, polarimeters, and other jacketed instruments. PolyScience Corp., 909 Pitner Ave., Evanston, Ill. 60202. 418

VICTOREEN OGRAPHS ACCEPTED for sensitivity

A-240

Circle N O 208 on Readers' Service Card

Thermoluminescence Detection /' Analysis Instrumentation The AIodel 2000 thermoluminescence analyzer, consisting of the &lode12000.1 TL detector and Model 2000B automatic integrating picoammeter, measures the response of a wide range of thermoluminescent materials: in either powder or solid form. The instrument has applications in health physics, nuclear medicine, and experimental dosimetry disciplines as well as in geological dating. The Harshaw Chemical Co., 1945 East 97th St., Cleyeland, Ohio 44106. 41 9

Surface A r e a Measurement The Ki-Count-1 apparatus was developed t o determine accurately the surface area of carbon black. The instrument measures the volume of pure nitrogen adsorbed by a sample of carbon black held under closely controlled conditions. Conditions for adsorption are an absolute pressure of 150 t o 350 mm of mercury and the temperature of boiling commercial liquid nitrogen ai: atmospheric pressure. The instrument was developed by Phillips Petroleum Co., and is being marketed by Chandler 420 Engineering Co., Tulsa, Okla.

Chromerge makes old, cumbersome methods of cleaning labware obsolete, , , eliminates danger and rime-wasting of previous methods of preparat i o n . , .long. unsatisfactory job of boiling SUIphuric acid with potassium dichromate. Chromerge does a better cleaning job, because its more powerful cleaning solution removes stubborn deposits which resist other cleaners, yet it protects Circle No. 135

glass surfaces, is chemically and bacteriologically c l e a n , , .preserves the capacity of volumetric wear. gives a perfect miniscus for precise volumetric work!

G R E I K E R SCIEKTIFIC ~

. L

C O R P O R A T I O N DeDt. 591 20-22 N. M o o r e St. N . Y . , N . Y . 10013

on Readers' Service Card VOL. 39, NO. 13, NOVEMBER 1 9 6 7

149 A

NEW PRODUCTS

:

you often run into problems that demand special purpose instruments. You may have to design and build your own equipment, through choice or necessity. We have produced a versatile system which provides the building blocks common to most instruments. The MP-System 1000 will perform almost any instrument function you can devise. The console, power supply, plug-in modules and accessories combine in hundreds of ways to produce research-quality equipment which meets exact needs.

I SEND ME the following illustrated MP-System laboratory manuals: I MPI Applications Notes Vol. 1 $1 I MPI Operation and Applications I Manual $2 0 New Laboratory Textbook by Dr. L. P. Morganthaler $3.50 I

----

State

I I I

I

I MCKEEI PEDERSEN INSTRUMENTS I BOX 322, DANVILLE, CA 94526 I

i

Circle No. 13 on Readers’ Service Card

150 A

a


,

Kent Chromalog, low-cost integration system, bridges the gap between mechanical and highly sophisticated electronic integrators for use in gas chromatography. The instrument may be connected directly t o a thermal conductivity detector or to the output of any detector preamplifier. It produces an immediate, numerical printed record of the quantity of each constituent present in the sample. Input ranges between 0 to 0.5 mV and 0 to 10 mV are available in five discrete steps. Counting rate is 2500 counts/rninute at full scale on all ranges. Chemicon Co., 839 Beacon St., Boston, Mass. 02215. 42 1

er Balance?

,

Multimeasurement W a t e r Pollution Instrument

---------------

Street City

.

The Xodel 9500 water quality monitor provides constant 24-hour measurement of all or any combination of the following variables: pH, chloride ion, oxidation-reduction potential, conductivity, dissolved oxygen, temperature, turbidity, and solar radiation intensity. The instrument is modular and provides independent sample flow to each sensor; flow rates can be collectively or individually controlled. AmpIifiers provide 4-20 milliampere dc output; the signal is compatible with analog-todigital devices. Process Instruments Division, Beckman Instruments, Inc., 2500 Harbor Blvd., Fullerton, Calif. 92634.

22

Elemental Analyzer Conversion Unit Conversion of the Model 240 elemental analyzer for oxygen analysis, as well as simultaneous carbon, hydrogen, and nitrogen, requires only replacement of combustion tubes, addition of a glass connector, and changing the oven temperature. The instrument offers quantitative accuracies with a precision of 2 0.3% and accepts samples as large as 3 mg. Perkin-Elmer Corp., Main Ave., Xorwalk, Conn. 06852. 423

The Cahn GRAM Electrobalanc8has a platinum band instead of knife edges, for better performance and reliability. N o routine maintenance to remember. , , or forget. So rugged and immune t o its environment, you can use it where you need it; so stable it is used for long term experiments; and so well built it IS used in high vacuum and corrosive atmospheres. It has earned a reputation for reliability i n thousands of laboratories. So easy t o use that anyone can be trusted t o use it. So fast that no one will want t o use anything else. Complete weighings take a fraction of a minute and the Electrobalance reads directly in milligrams or micrograms. You can weigh small samples with a precision of one-tenth microgram (lo-’ grams), weigh samples up ,to one gram. Eleven ranges let you use this one balance for a variety of tasks which previously required several different instruments. Looking for a better balance? Get a Cahn GRAM Electrobalance.

Phone or Write for details


NEW PRODUCTS

Gelscan, automatic recording and integrating scanner, is designed for use with electrophoretic separations on standard cellular acetate membranes and other electrophoretic support media, and chromatographic separations on prepared strips or 5 X 20 cm plates. The instrument operates on the principle of densitometry and uses four different filters: red, blue, green, and clear. Various carriers are available depending on the media being scanned. The recorder portion may be detached and used separately as a logarithmic mV recorder. The, Gelscan has 11 input voltages (2 mV to 20 V dc); six different chart speeds; and two different scanning speeds. Gelman Instrument Co., P. 0. Box 1448, Ann Arbor, Mich. 48106.

424

Computerized and Automated X-Ray Diffraction System A closed-loop system which links a Digital Equipment COT. PdP-8 or PdP-8S computer with Picker Xuclear’s four-circle x-ray diffractometer is available for single-crystal x-ray diffraction studies. A “FACS-1” interface provides two-way communication so that the computer and diffractometer can in effect talk back and forth to each other while crystallographic data are being collected. Kecessary adjustments are made automatically while data collection is underway. Standard input/ output components offer a choice of teletypewriter or %hole punched paper tape ‘(punched card or magnetic tape are options). The system includes a complete set of documented software (programs) for representative datacollection techniques. Picker Kuclear, 1276 Mamaroneck Ave., White Plains, IT.Y . 10605. 425

Automatic Pipet Biopette, a new automatic pipet, does not touch the liquid it pipets. The device delivers volumes of 0.1 ml or 0.2 ml with an accuracy of +- 3%. The addition of an adapter permits delivery of 0.05-ml samples. The measured aliquot is held in a disposable plastic tip: to change from one liquid t o another, a new tip is inserted. Schwarz BioResearch, Orangeburg, N. Y . 10962. 426

VICTOREEN CHROMATOGRAPHS ACC EPTED,,,for versafility A454


If your laboratory oven doesn’t have Solid State Temperature Control

of =0.1”, you’re getting short-changed! With Hotpack’s exclusive ACCUMATO solid state temperature control system you’re not only assured pinpoint control of 20.1”, but max. imum safety and reliability, too! For ultra.rellability, in the event of accidental adjustment or malfunction, your workload, equipment and personnel are protected by the automatic LIMITSTATE! The facility is automatically shut-off! Most of Hotpack’s oven, incubator and sterilizer don’t series have this control system built-in, at no extra cost , . get short-changed . specify Hotpack! Write today for our 48-page oven catalog.

.

HOTPACK CORPORATION 5004 C o t t r n a n Ave. Phila., Pa. 19135 IN CANADA: HOTPACK (CANADA) LTD WATERLOO, ONT. Circle ND. 144 on Readers’ Service Card VOL. 39, NO. 13, NOVEMBER 1967

151 A

NEW PRODUCTS

VI CTOREEN CHROMATOGRAPHS ACCEPTED for linearity a

a

A-356

Automatic sample injector for gas chromatography is offered in a choice of models and can be used with all major brands of gas chromatographs with vertical columns. The injector was designed for the analysis of steroids and pesticides. Scientific Systems Corp., 6453 Choctaw Dr., Baton Rouge, La. 70805. 427

Gas Chromatography Infegrator Circle No. 176

on Readers’ Service Card

The Model 477 electronic digital integrator now brings t o four the number of integrators available from Yarian for gas chromatography quantitation needs. The newest, Model 4 i i , automaticilly detects peaks from 1 t o 140 millivolts, corrects for base line shifts, and provides automatic, unattended peak integration of five digits. Precision and reproducibility of data are better than 0.1%. T’arian Aerograph, 2T00 Mitchell Dr., Walnut Creek, Calif. 94598. 428

Model 1582 summatic digital integrator provides precise and rapid digital presentation of integrated peak areas for scientific instruments whose analytical information is displayed in peak form. The integrator may be connected directly to the detector of a chromatograph or other analyzer; results are presented on paper tape. NesterIFaust Mfg. Corp., 2401 Ogletown Rd., Newark, Del. 19711 429 Circle NO. 108 OR Readers’ Service Card

152 A

a


NEW PRODUCTS

Temperature controller and circulator is designed for use with water or oil within the range -20' to $200' C. The TE-3 will control bath temperatures to within k0.05" C under optimum conditions and can circulate external apparatus at controlled rates up to 10 liters per minute or against static head up to 60 inches. The ternperature controller is designed particularly for use with a bath, Model WB-3, which holds 4.8 gallons and is specially constructed for use at 200° C. Techne (Princeton) L t d . , 661 Brunswick Pike, Princeton, N. J .

430 C l i n i c a l D a t a Acquisition System

Ccqrs c'feis a ccmr: ete ranje of casseroles. dishes, capsules a'nd plate; for laboratory evaporation. These pieces have been created to match the exacting requirements of working chemists who require especially high quaiity, uniformity and reliability. Standard items include fiat bottomed dishes, such as t h e $160 capsules, r 1 8 2 casseroles, #431 and $470 dishes. A wide variety of shallow, curved bottom dishes are also available. These include the $430 regular evaporation dishes, $170 capsules, ~ 1 8 0 $181, , $190 casseroles, and the -4440 and 4450 dishes. For drying organic precipitates by evaporation and absorption, the +760 porous plate is offered. A complete selection of Coors laboratory evaporation equipment is immediately available through your laboratory dealer. INSIST T H A T Y O U R LABORATORY PORCELAIN WARE CARRY THIS M A R K OF OEPENDABILITY

UAA. COORS P O R C E L A I N C O M P A N Y , GOLDEN, COLORADO


The new clinical data acquisition system has been developed t o handle hospital and clinical laboratory data. The system will automatically proces- analog signals generated by automatic analyzer stations, analyze the data, and provide typewritten reports. Typical blood and body fluid analyses vhich the system is capable of handling are creatinine, calcium, chloride, alkaline phosphatase, uric acid, cholesterol, PBI, glucose, sodium, potassium, carbon dioxide and total protein. The system includes a general-purpose digital computer and responsive teletypewriter. Electronic Associates, Inc., West Long 43 1 Branch, N. J.

Chemically inert No mixing cavities Quick connecting Leakproof at 500 psi. C h e m i n e r t T v valves a n d fit-

Amplifiers

Model 1418 spectroscopy amplifier has adjustable pole/zero cancellation via front panel, 10-turn, fine gain control, linear integrated circuit construction. ultra low noise contribution (less than 6 pV rms referred t o input, and internally selectable gaussian shaping time constants of 0.5, 1.0, and 2.0 pet. The Model 1417 is similar to Xodel 1416 but it has added features. It has selectable gaussian shaping time constants of 0.25%, 0.5, 1.0, 2.0, and 4.0 p e e ria front panel control and adjustable controk t o set dc level outputs. Canberra Industries, Middletown,

corn.

432

tings will c u t h o u r s f r o m the time y o u spend assembling tubing for chemical analysis. You c a n c o n n e c t a n d d i s c o n n e c t everything w i t h y o u r hands, m a k i n g finger-tight j o i n t s t h a t won't leak at 500 psi. 0 T h e r e are fittings f o r 1/16" a n d 1/8" tubing. They h a n d l e nearly any f l u i d b e c a u s e only c h e m i c a l l y inert materials-Teflon. Kel-F a n d g l a s s - t o u c h the stream. All are d e s i g n e d w i t h zero d e a d v o l u m e ! so there will b e n o m i x i n g . Other advanced Chromatronix apparatus includes p r e c i s i o n p u m p s t h a t p r o d u c e unfluctuating flows at p r e s s u r e s u p to 500 psi, a n d high-resolution c o l u m n s for l i q u i d c h r o m a t o g r a p h y . Send for catalog.

C H ROMATRO N I X Chromatronix, Incorporated, 2743 Eighth St., Berkeley. Calif. 94710. Phone (415) 841-7221 Circle No. 36 on Readers' Service Card

VOL. 39,

NO. 13, NOVEMBER 1967

153

Photoelectric

luorometers

NEW PRODUCTS Gas Chromatography Programmer and Valves The series 2000 programmer is designed t o automate micro volume valves in single valve operation in gas chromatography. Time intervals are easily set on the panel mounted timer t o inject gas or liquid samples. It will also automatically perform column and detector switching, stripping, and other single valve switching applications. This model 1s a simpler companion unit t o the more versatile and complex Series 2100 programmers. The company also offers a series of 360' rotation switching valves for use in fraction collection or stream selection in gas chromatography plus step-wise selection of solvents and effluent switching in liquid chromatography. Carle Instruments, Inc., 532 South Roee St., 433 Anaheim, Calif.

Mass Spectrometer/Gas Chromatograph Interface 535.A So. 5th Avenue Mt Vernon, N. Y. 10550 914 668-9393/Cable Address: FOCIUS NY ~

See ACS Laboratory Guide for A l l ProduWSales Ofics


I

POiN TS IN SECONDS

MELTIN

Determine molecular weights, eutectic temperatures, identify and evaluate purity of substances using KOFLER MICRO METHODS AND THERMAL APPARATUS

...

The 5'-5500 hIS/GC accessory transfers organic materials in gas chromatographic effluents from the GC flow stream to the source of a mas8 spectrometer and a t the same time prevents any appreciable flow of carrier gas into the mass spectrometer. The system is based on the Llewellyn permeable barrier molecular separator which gives enrichment of from lo4 to 108/liter with sample recovery from the GC flow of 50% or greater. The GC output is a t atmospheric pressure. Performance is insensitive t o GC flow rates or type of carrier gas. Tarian Analytical Instrument Division, 611 Hansen Way, Palo Alto, Calif. 94303 434

Particle Size Micrometer and Analyzer

- __ - - -.__ - -

..

-

-

Box 646,West C>ldwell, New Jersey 07006 (201)226-8450

1 Circle NO. 57 on Readers' Service Card

154 A

e


A particle size micrometer and analyzer is used for sizing and counting in the range from 0.5 t o 400 microns. The instrument is opto-electronic and can be used with microscopes of all makes. Particles may be classified and counted into any of up to 10 size groupings which can be preset according to desired dimensions. Accuracies of about 2% are achieved with semiskilled laboratory personnel. The instrument can be operated either for exact measurement of diameters or as a grading device. The instrument is made by Fleming Instruments, Ltd., and distributed in the L-.S. and Canada by Vickers Instruments, Inc., 15 Waite Court, Maiden, Mass. 02148. 435

NEW PRODUCTS

X-Ray Diffraction Accessories

Dynamic I R c o m p e n s a t i o n p e r m i t s precise half-wave potential measurements with t h e M o d e l SSP-2 at both f a s t and slow s c a n r a t e s . T h i s i s t h e latest high-speed, singiesweep polarographic system with image s t o r a g e f r o m C h e m t r i x . It i s t h e only oscillographic polarography system with: 1) D y n a m i c a l l y - c o n t r o l l e d p o t e n t i a l . 2) I m a g e s t o r a g e u p t o o n e h o u r . 3) C y c l i c d i s p l a y of b o t h c a t h o d i c a n d a n o d i c p e a k s . 4) 0.5, 1, a n d 2-volt c e l l s c a n r a n g e s . 5) C e l l s c a n d u r a t i o n s f r o m 0.1 t o 10 s e c o n d s . 6) S i n g l e s c a n s t r i g g e r e d by d r o p f a l l . 7) F i r s t a n d s e c o n d derivative m o d e s . 8) D i s p l a y of I T c u r v e s .

The greater IR drop characteristics of low-concentration electrolytes is illustrated in this photograph of two singie scans stored on the face of the cathode-ray tube. Both peaks are indium in 0.1M K C I with a cathodic cell scan of 0.5 volt starting at 0.4 volt negative. The peak at right is the response with the two-electrode system showing potential displacement, as compared t o the peak at left in which the I R component of the electrolyte Is compensated for by the corrective action of the SSP-2 threeelectrode system. Model SSP-2 Three-Electrode Polarographic Analyzer System . , $2790 Model SSP-1 Two-Electrode Polarographic Analyzer System . $2685 Write for your free copy of the new booklet, “Applications of Single-Sweep Polarography with the Storage Oscilloscope.” U.S.Sales Prices F.O.B. Factory

CHEMTRIX. INC. P.O. Box 725

Beaverton, Oregon 97005 (503) 648-1434 Circle No. 4 on Readers’ Service Card

Several pieces of equipment are now available for users of x-ray diffractometers. Included is an Auto-Focus specimen holder, Type PJV 1154, which continuously bends a flexible holder, so that the surface of the specimen remains in coincidence ivith the focusing circle of the diffractometer goniometer a t all values of the Bragg diffraction ingle. The PW 1075 curved crystal focalixr, which can be used with the company‘s diffractometera, has a number of Applications: t o study texture by conip:rrison of transmission and reflection diagrams: to measure large d-spacings; t o measure angular errors due t o dpviations of specimen surface; to study line profiles, etc. The P R 1077 is a set of alignment tools designed t o ease the alignment of diffractometers. The Ply 1089 is a aacuum attachment for use with the company’s diffractometers. This accessory fits both Tertical and horizontal goniometers. Finally, the company offers the P R 1152 x-ray focusing monochromator which replaces normal receiving slit and beta filter assembly and provides improyed peak-tobackground ratioj. Philips, Eindhoven, 436 The Netherlands.

Digital Data Recording System Conversion of signals from lsboratory instruments into computer language is accomplished automatically with a digital data recording system. Output can be visually displayed or recorded on punched paper tape, magnetic tape, or standard I B I I cards. Eight operating models are aaailable. Capabilities range from simple digital recording of ordinate values on manual command, to automatic and simultaneous recording of ordinate and abscissa data while detecting and recording spectral peaks and d l e y s . Scientific Instruments Division, Beckman InFtruments, Inc., 2500 Harbor Blvd.. Fullerton, Calif. 92634. 43 7

Laboratory Concentrators Performance data on two new laboratory concentratore indicate highspeed concentration of liquids, even thermolabile foods and pharmaceuticals. The units operate a t adjustable reduced temperatures and preesures and provide rapid concentration of such materials as syrups, fruit juices, gelatin liquors, biologicals, etc. 11Iodels available are 1-liter with either a stainless steel or brass condenser, and N i t e r with a stainless steel condenser. Precision Scientific Co., 3737 W. Cortland St., Chicago, Ill. 60647. 438

Introducing Warner- Chilcott’s 0PERAT10N GRASP

Operation WHAT? Operation GRASP is Warner-Chilcott’s unique training school for customers interested in gas chromatography. It stands for Gas Review and Applications Study Program. We’ve been kidded a lot about the name. In fact, we have even thought of changing it! But customers who have been to the school tell us that after we’ve taken them from theory through applications, they do have a good grasp of gas chromatography and Warner-Chilcott’s Gas Chromatographs. Get a good GRASP of gas chromatography! The school is free (except for transportation) if you buy a Warner-Chilcott Gas Chromatograph. Classes are held on both the East and West Coasts. Contact your Warner-Chilcott Instruments Salesman o r write to us directly if you would like more information, We’ll send you a brief course outline and descriptive literature. Request Data File GC-2.

WARN ER- C 61I LCOTT I NSTRUMENTS DlVlSI0 N 200 South G a r r a r d B l v d . R i c h m o n d . C a l i fo r n ia 94804 Circle‘No. 182 on Readers’ Service Card VOL. 39, NO. 13, NOVEMBER 1967

155 A

FOR EVERY CRITICAL CLEANING NEED IN LABORATORY OR H05PITAl!

All BIODEGRADABLE! BEST BY TEST foi wetting powei, sequestering pobvei and emulsifying eftect for all general laboratory, hospital and surgical glassivare. equipment and i n s t r u m e n t s Completely soluble a n d rinsable PerfeLt foi ultrasonic washers.

THE MASTER CLEANER F o r manual cleaning. Meets highest government specifications’ In 3 Ib. boxes, and 25, 50, 100, 300 lb. drums.

3 Ib. BOX-$2.12 Case o f 12 Boxes- $20.00

ALCOJET prevents w a t e r - s p o t t i n g from final rinse, f o r scientifically-clean glass, metals, plastics, etc., in all mechanical washers. In 5 Ib. boxes and drums as above.

i-

5 Ib. BOX-$3.00 Case of 6 Boxes-$1 5.00

I

ALCOTABS F o r syphon-type pipette and lest tube uashers-one easy operation! I n 100tablet boxes.

Box of 100 Tablets-$5.00

.

In A d d i t i o n . .

You Receive FREE of Charge:

1. Pre-fixed slits and tube with no tuning or adjustments required.

2. Direct readout meter in torr. 3. Measures both partial and total pressure. 5. Continuous scan two minutes or 30 seconds. 6. Nude ionization source.

If you have a p r o b l e m in identifying gas residuals, leak d e t e c t i o n , o r measuring C o n t a c t o n e of t h e following A e r o Vac representatives neartotal pressure e s t you

.

617/894 8399

02154 TROY N Y 12181 Aero Vac Corp P 0 Box 448

5181274 5850

w AERO

Circle

156 A

BALTIMORE. M D 21240 Aero Vac Corp Friendship International Airport

P 0 Box 8673 301/277 4799

VAC GORP.


LlQUlD DETERGENT! For manual clea’ning. Mild ( n e u t r a l p H ) . Non-toxic. Contains n o phosphates. Equally effective in hard or soft water. Outstanding blood and fat solvent. In quarts, gallons, & 15 gal. drums.

4. Dual non-contaminating filaments.

WALTHAM MASS Aero Vac Corp 25 Grant St

THE PERFECT

HUDSON OHIO 44236 Aero Vac Corp P 0 Box 236 216’653 5007

1

PER QUART-$2.1 5 Case of 12 Quarts-$l9.92 PER GALLON-$7.00 Case of 4 Gallons-$24.00 All prices slightly higher West of Rockies.

MATHESON MAlHtSON

SCIENTIIF IC

CHICAGO 0 CINCINNATI CLEVELAND DETROIT 0 HOUSTON 0 KANSAS CITY LOS ANGELES 0 HAYWARD, CAL. PHILADELPHIA 0 BELTSVILLE. MD. 1

TROY, NEW YORK

TELEPHONE 518-274-5850

No. 159 on Readers’ Service Card

Circle

No. 110 an Readers’ Service Card

High Purity Barium Niobate, Strontium Niobate, and Calcium Fluoride New high purity barium niobate and strontium niobate have total impurities, with the exception of tantalum, of less than 10 ppm, Tantalum is less than 100 ppm. Particle size is in the range of 4 t o 12 microns. Calcium fluoride is available in two grades, with total impurities of less than 30 ppm or heavy metal impurities of less than 30 ppm. Electronic Space Products, Inc., 854 South Robertson Blvd., Los Angeles, Calif. 90035. 501

Solid Mixtures of Liquid Crystals Solid mixtures of liquid crystals in gram to kilogram quantities for nondestructive testing and surface temperature measurement of metallic and nonmetallic surfaces, laminates, sub-surfaces, and honeycomb structures are now available. The nonvolatile solid mixtures can be prepared to any desired concentration and applied directly t o the test surface, The temperature ranges of the mixtures are from minus 6' C to 65' C with a 3' C interval for the thermograph. Pressure Chemical Co., 3419 Smallman St..Pittsburgh. Pa. 15201. 502

A p l a n n e d a s s o r t m e n t of silylation grade reagents a n d solvents that sets you u p for p r o d u c i n g volatile a n d thermally stable trimethylsilyl or dimethylsilyl derivatives of polar c o m p o u n d s by your choice of several easy routes. Materials are contained i n convenient Hypo-Vials that allow immediate access with c o m p l e t e protec-

pamphlet

Packaged i n a beautiful m o l d e d polyolefin attache case that you w i l l treasure for years. T h i s case i s light, c o m p a c t and rugged; just right for notes, papers a n d references at meetings, conferences and trips. 490 137 P 0 L Y . S I L KIT, complete silylation kit $84 each' 6 o r more kits $75 each

PIERCE CHEMICAL COMPANY P . O . Box 117 Rockford, Illinois 61105 PHONE 815-988-0747

T W X 9104314419


The Jinest Oils, Greases, Waxes

a

for High Vacuum Work-also Lubricant for High Vacuum Equipment, Masking of Circuit Boards and Other Scientific Applications

Atomic Absorption Standards

Vacuum pressures of these excellent oils are as low as 10-7 torr. Greases as low as 10-11 torr at room temperature. Scientists, who try Apiezon oils, prefer them for equipment used in nuclear physics, cyclotrons, electrical equipment, vacuum tubes, etc.; the greases for general laboratory work and gas-liquid chromatography; wax W with suitable solvent as a masking media.

Standardized solutions of 15 commonly determined metals are now available in two standard concentrations: 1000 parts per million (1 ml of standard contains 1 mg of metal), and 10,000 pprn (1 ml = 10 mg). Packaged in one-quart and six one-quart (6 pack) polyethylene bottles, the metals offered are Ca, Cu, Cr, Co, Fe, Pb, Li, LIg,X n , Ni, K, Ag, Na, Sr, and Zn. Fisher Scientific Co., 711 Forbes Ave., Pittsburgh, P a . 15219. 503

As exclusive distributor in the United States, we offer immediate shipment from stock on the complete range of Apiezon products.

Indicator Solution for Kjeldahl Nitrogens An N-point indicator solution for quicker titrations of Kjeldahl nitrogen determinations turns from green t o gray color as the end point approaches, then sharply turns t o red at the end point. The solution is available in pints and gallons. LIC&B, P. 0. Box 85, East Rutherford, N.J. 07073. 504

t i o n of contents. Instruction included.

For applications, working characteristics, and list prices, write for new Bulletin 43-AC. %t.

AC

Electrical and Speed Measurlng Instruments

f

PLYMOUTH MEETING, PENNSYLVANIA 19462 Phone 215/646-9200

$ 1

/ I

i

Circle No. 32 on Readers' Service Card VOL. 39, NO. 13, NOVEMBER 1967

157A

FLAMELESS BLOW TORCH

~

F O R FAST HEAT "P

l,oo

to

For applications requirlng quick conce trated heat blast up t o 1000' F., w i t h o u flame. Soften, form, mold and patch plas tics, etc. Temperature varied b y air intake adjustment. 110-230 V. AC motor 3 wire plug. A l l 110 V. models equipped w i t h adapterfor 2-prong receptacle. 8 ft. heavy dutycord. I n t e r m i t t e n t d u t y . Othermcdels available w i t h lowertemp. ranges. Mostof t h e big names i n industry use MASTER HEAT GUNS in laboratories or In production. Model H G 501-500" F. 115V-$49.90 (Others $44.30

to

The right place is that book sitting on your desk - CHEMICAL MATERIALS CATALOG. You'll find what you want - facts. All the latest facts on chemicals and raw materials, ready to hand, ready to use, ready t o spread out in front of you. And FAST! CMC is organized and updated by process men for process men. It's a whole library i n one volume, with a &way index that takes you straight t o the nuggefs of information you need.

!

$67.85)

AIR HEATER BLOWER

I

For quick electrically heated air up 750' F. For accelerating drying processes or for localized heating. B.T.U. 3400. Air velocity 2000 FPM 110-230 V. AC only. 3 wire plug. A l l 110 V. models equipped w l t h adapter for 2 prong receptacle. 8 f t . heavy d u t y cord. Continuous duty, 2" dia. x 3" long discharge nozzle. Model AH-501-500' F. 115V-$59.95 (Othevs f r o m $56.65 t o $90.25) s Write today to Dept. 17 Send for information o n hair dryers, hand and foot massagers, vibrators, grass trimmers, hair clippers, food blenders, and air purifiers. See c u r sDecs in VSMF to

REINHOLD PUBLISHING CORPORATION

A subsidiary CHAPMAN.$ of REINHOLD, INC.

430 PARK AVENUE NEW YORK, N. Y. 10022 Circle NO. 15 an Readers' Service Card Circle NO. 74 on Readers' Service Card

New From Bio-Rad "Lif etime" Lang-Levy Pipets of Polypropylene U n b r e a k a b l e Ingenious design and polypropylene plastic make these fine L a n g - L e v y pipets virtually u n b r e a k a b l e in n o r m a l u s e They c a n b e used with organic a n d inorganic solvents, cleaned with regular laboratory detergents and autoclaved They c a n be d r o p p e d , t h r o w n or tossed without fear of breakage. A c c u r a t e These " l i f e t i m e " Lang-Levy pipets are m o r e accurate than most glass m i c r o - c o n s t r i c t i o n pipets now on the m a r k e t Small sizes, 1 - 5 01, are c a l i b r a t e d to deliver their listed v o l u m e s within 5 0 1 Ui, larger sizes w i t h i n 1 0% All c o m m o n l y used sizes are available from stock.

*

Full details, i n c l u d i n g p r i c i n g , are i n Price List MP-1. __-__________--__-------I i I 1 7

Dept A-5

1

Bio-Rad Laborator-n

I

Gentlemen, Please send my f r e e c o p y of Price List MP-1 w h i c h In- I ciudes f u l l details as well as prices.

1

I

Avenues, Richmond C a l i f 94804

NAME

TITLE

I ORGANIZATION I ADDRESS

I

- -_ _ _ - - - - -

CITY

L-

_---. - - - -

STATE


158 A

0


I I I I I I I

a Range 20" to 34' C.

0

T h e r m i s t o r actuated.

0

D i g i t a l display readable to 0.0005" C. Rise m e a s u r e m e n t s repeatable to

+/-

0.001' C.

Error f r e e t e m p e r a t u r e r i s e m e a s u r e m e n t s i n b o m b c a l o r i m e t r y can n o w be m a d e e a s i l y and w i t h e x c e l l e n t p r e c i s i o n u s i n g t h i s n e w , d i r e c t reading, digital t h e r m o m e t e r . Readings can be recorded w i t h a d i g i t a l p r i n t e r w h i c h is available as an accessory. W r i t e or phone (309) 762-7716 f o r Parr S p e c i f i c a t i o n 1650 g i v i n g c o m plete details.

J


Plastics Catalog. Catalog 967, 68 pages, contains information and prices on plastic items for laboratory and industry. Bel-Art Products, Pequannock, Ti,J. 07440. 60 1 Flame Ionization Detector.

Bulletin

SB FID, 2 pages, describes the Model 12-100 flame ionization detector, designed for fabricating into detector si’stems. Gow-&lac Instrument Co., 100 Kings Rd., Madison, N. J. 07940. 602 light Measurements. The following 2-page data sheets describe the mentioned light measurement instrumentation: rp-10: IL GOO research photometer; fi-20: IL SOO/SlO flash integration system : pd-60 : IL 600/620 digital photodosimeter system: pa-50: PT 100, PT 200 Series photosensor assemblies; gf-30: optical glass filters ; and if-40: optical interference filters. International Light, Inc., 12 Cnicorn S t , Sewburyport, &lam. 01650. 603

Usually, it doesn’t matter which brand you s p e c i f y . .

.

.

, ,unless you’re

in a hurry

Clean Rooms. A 20-page brochure describes Iaminar flow equipment for medical and biological, electronic, industrial, pharmaceutical, and scientific research purposes. Enyirco, Inc., 630 Haines Ave., N. W., Albuquerque, N. hl. 8710T. 604 Electrophoresis Manual. A 36-page manual gives information on procedures, techniques, and apparatus for electrophoresis. Gelman Instrument Co., P. 0. Box 1448, Ann Arbor, hIich. 48106. 605

laboratory Equipment. 1967-68 catalog, 350 pages, gives specifications and prices of 2500 laboratory instruments and equipment. Cole-Parmer Instrument and Equipment Co., 7330 N. Clark St., Chicago, Ill. 60626. 606 Fluorescence Microscopy. The instrumentation, theory, and applications of fluorescence microscopy are described in a 16-page brochure. Bulletin S o . 41-350-e also features information on accessory illuminating systems for adapting existing microscopes to fluorescence. Carl Zeiss, Inc., 444 Fifth Ave., New York, N. Y . 10018. 607

Order from any of several laboratory chemical catalogs and you’ll get quality products. However, if you’re in a hurry, your best bet is to use the MC&B catalog. W e list over 6000 reagents, and they are all, repeat all, available for prompt delivery. Laboratory chemicals are not a sideline at MC&B. They are our only business and we are very aware that the best way to increase this business is through service. MC&B Distributors have the same idea. Next time you’re i n a hurry, call your MC&B Distributor and say “ R U S H I T ” !

Norwood, Ohio f Los Angeles, California f East Rutherford, N. J . Circle No. 156 on Readers’ Service Card

VOL. 39, NO. 13, NOVEMBER 1967

159 A

clear su ie

improved for longer burner life BETHLEHEM BENCH BURNER irovements in the design and construction of 'this general-purpose gas-oxygen burner offer you these distinct advantages0 longer life of the burner head, by increasing the cooling area through the use of

more fins and an aluminum heat sink surroundingthe gear rack, for more effective conductivity. 0 maintains high rate of heat dissipation, by the use of chrome Dlated brass body and fins. 0 improved fuel control as a result of cooler operating needle valves. 0 faster, easier settings with angle adjustment knobs on both sides of burner.

PMPD $165.00

Model B With bracket mount, the burner may be used as a lathe fire-small or large flame at any angle.

Buy 'em from

BETHLEHEM APPARATUS COMPANY, INC. HELLERTOWN, PA. Circle NO. 8 an Readers' Service Card

direct-order supply catalogs

CELL RECONDITIONING SERVICE CELL RECONDITIONING SERVICE

CELL RECONDITIONING

3nd get same-day-shipment service on 911 these off-the-shelf Nuclear items: dials 'rimary Fluors secondary Fluors Standards Solvents luench Sets 'lanchets and ioiders >ounting Gas rest Sources

Storage Cabinets Syringes Filters Absorbent Paper Printer Paper and Ribbon Sample Dryer Warning TaDes and Signs

rom the nearest of our coast-to-coast itockpoints. Direct-to-you delivery neans you can now fill every need whenever you feel the need. And who mows your analyzer supply requirenents better than the instrument manIfacturer? Other catalogs list supplies or IR, UV, GC, pH, Atomic Absorption, \quameters & Titrators, Pumps & Fittings. Order the specific catalogs YOL need now and take advantage of spe. cia1 introductory offers. Contact your iearest Beckman office or write direct For Data File No. 1301D.

ICL, recognized leaders in the manufacture of infra-red cells and crystals is also widely known for its CELL RECONDITIONING SERVICE that's fast, expert and lowcost. Now, you can free yourself from this frustrating maintenance problem as have many universities and companies in the

$

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INSTRUMENTS, INC. SCIENTIFIC INSTRUMENTS DIVISION FULLERTON, CALIFORNIA * 92634 V T E R P I A T I 0 N A L S U ~ S I D l A ~ I E S : G E N E V A ;MUNICH;GLENROTHE! COTLAND; TOKYO: PARIS: CAPETOWN; LONDON; MEXICO C F


160 A


E-

Phone (201) 373.4242

CELL RECONDITIONING SERViCE CELL RECONDlTlONlNG SERVICE CELL RECONDITIONING Circle NO. 18 on Readers' Service Card

THE WELCH CRVOREFRIGERATOR IS A NEW CONVENIENCE FOR LN, USERS

MANUFACTURERS' LITERATURE Power Supplies. A new product catalog, B-678, 48 pages, includes data on 22 different power supply design groups (seven are described for the first, time.) Kepco, Inc., 131-83, Sanford Are., Flushing, N. P. 11352. 608

Cat, 554-433, 6 pages, provides information on the GC48P Series gas chromatograph. Included are specifications and lists of accessories. Shimadzu Seisakusho, Ltd., 1-14-5 Uchikanda, Chiyoda-ku, Tokyo, Japan. 609 Gas Chromatograph.

su

Bulletin 4075-A, 8 pages, provides complete specifications and descriptive material on the company's Model 82 data processor for yehicular emissions analysis. The instrument is used in conjunction with the Beckman/Scott vehicular exhaust emissions analysis system. Beckman Instruments, Inc., 2500 Harbor 61 0 Blvd., Fullerton, Calif. 92634.

Vehicular Emissions Analysis.

Inert Gas Purification System.

H o w convenient depends on watched an whether you have

...

experiment evaporate because your LNz (liquid nitrogen) delivery was late or gone to the dewar and found or run down the hall it was d r y . or been just plain t o "borrow a cup" fed up because you don't use LNz often enough t o guarantee its availability when you need it. If you have been inconvenienced by LNz, why not invest $375 i n a permanent cold source, a Welch Cryogenic Refrigerator? It's a l o w cost way t o declare your independence from LN2 troubles. Slightly more than one foot high, it weighs only 12 pounds. ., really portable. I

..

..

I

I

.

The We1c h Cryogenic Refrig erator operates on a standard laboratory source of compressed air t o obtain temperatures in the -140'C region. There are specific models at $396 for CEC, GE, NRC and Veeco leak detectors. A general purpose unit is available at $375 which can be adapted for applications in mass spectrometry, gas chromatography, solid state circuit production, tissue freezing, etc. If you'd like to declare your independence from LN2 ask for Bulletin 112. Call or write The Welch Scientific Company, 7300 N. Linder Ave., Skokie, Illinois 60078. Telephone 312/677-0600


A 4-

page bulletin introduces a system whereby inert gas passes through liquid metal in a closed loop bubbler system to purify it to a moisture and oxygen content of less than 1 ppm. The unit is self-contained in a metal cabinet. Kewaunee Scientific Equipment, Adrian, hlich. 49221. 61 1 Programmed Temperature Analyzer.

A 4-page bulletin, 0718-13, describes the &I-S-A 550-PT programmed temperature analyzer that expands the capabilities of on-stream, automatic analysis by GC from 200" t o 400" C. Mine Safety Appliances Co., 201 S . Braddock A x . , Pittsburgh, Pa. 15208. 612

A 4-page bulletin pictures and gives specifications and operating information on the Series SC-20 rapid cycling titanium pumped high vacuum system. Ultimate pressure obtainable is 5 X 10-9 torr or better. Andar Corp., 185 E. Evelyn Sve., Mountain T'iew, Calif. 94040. High Vacuum System.

613 Flame-€mission Spectrometer. Bulletin 2417 describes a flame-emission spectrometer which is available either as a discrete instrument or as an accessory to company's monochromators already in use. Limits of detection are listed. American Instrument Co., Inc., 8030 Georgia Aye., Silver Spring, hId. 20910. 614

Buy 'em from Beckman direct-order supply catalogs and get same-day-shipment service on all these off-the-shelf Atomic Absorption items: Hollow Cathode Lamps Osram Vapor Discharge Lamps Lamp Hilders Standard Solutions

Glass Sample Beakers Polypropylene Sample Beakers Sample Boats Recorder Supplies

from the nearest of our coast-to-coast stockpoints. Direct-to-you delivery means you can now fill every need whenever you feel the need, And who knows your analyzer supply requirements better than the instrument manufacturer? Other catalogs list suppiies for IR, UV, GC, pH, Nuclear, Aquameters & Titrators, Pumps & Fittings. Order the specific katalogs you need now and take advantage of special introductory offers. Contact your nearest Beckman office or write direct for Data File No. 1302E.

INSTRUMENTS, I NC. SCIENTIFIC INSTRUMENTS DIVISION FULLERTON, CALIFORNIA * 92634 INTERNATIONALSUBS 0IARIES:GEVEVA; MUNICHjQLENROTHES SCOTLAND; TOKYO; P A R I S ; C A P E T O W N ; LONDON; M E X I C O CITY

Circle No. 201

on

Readers' Service Card

VOL. 39, NO. 13, NOVEMBER 1 9 6 7

e

161 A

CONCENTRATION..

su

P

lies

.

OSMOMETER

an extremely valuable concentrative index for biological solutions The concentration of particles in solution can be measured in a number of ways, for many applications, h o w e v e r , o s m o t i c c o n c e n t r a t i o n i s superior t o other common indices

o..

The ideal instrument

PARTICLE PARAMETERS WHICH AFFECT VARIOUS CO\CE\TRATILE I\DICES

0

In. Electrolyte Balance, lance, Renal Function, Dialysis, Total Bodv

0 0

Fast 0 Easy Rugged Reliable 0 Sensitive Specific 0 Modular

Let us send you FREE pamphlets. "A Physical Chemistry Review - Measuring The Concentration of Solutions", a bibliography, applications information. and a brochure on Advanced Osmometers. Write or call collect today.

(25

a__+ dlDVANCED

a

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/ 617 DEcatur 2-8200 N e w t o n Highlands, Massachusetts, 02161 Circle Nu. 19 on Readers' Service Card A low cost Analyzer that does everything the larger units do.

and get same-day-shipment service on all these off-the-shelfpH items:

1

EVERY ONE

Glass Electrodes Reference Electrodes Specific Ion Electrodes Combination Special-purpose Electrodes Electrodes; thin Filling Solution for probes, small reference electrodes samples, blood Buffer standardsDesicoteB rinsing aid liquid and powder and other original equipment supplies for Beckman p H Meters

from the nearest of our coast-to-coast stockpoints. Direct-to-you delivery means you can now fill every need whenever you feel the need. And who knows your analyzer supply requisements better than the instrument manufacturer? Other catalogs list supplies for IR, UV, GC, Nuclear, Atomic Absorption, Aquameters & Titrators, Pumps & Fittings. Order the specific catalogs you need now and take advantage of special introductory offers. Contact your nearest Beckman office or write direct for Data File No. 1303E.

INSTRUMENTS,INC.

44 K e n n e t h Street

THE PHOENIX MICRQ-ANALYZER MODEL M-7800 Featuring: High Speed analyses of Amino Compounds Fully Automatic System Compact Lab Bench Size Moore.Stein or PiezMorrIs Operation Same time-woven comDonents as used in instrumentation costing twice as much Designed primarily for the small lab * Can make separate routine analyses I f you are concerned with the analyses of amino or imino acids, peptides, am. monia, urea, creatinine, or other com. pounds, you will find the Phoenix Micro. Analyzer Model M-7800, the lowest cost instrumdnt available that is capable of providing fully automatic high.speed chromatography. If you are concerned about the'high price of amino acid analyses instrumentation, why not show your concern by sending for Instrumentation Data. Sheet MA.566.

L

CONCERNED WITH

,

PHOENIX PRECIS1ON INSTRUMENT CO. A St.h,idmtq of

INSTRUMENTS, INC. SCIENTIFIC INSTRUMENTS DIVISION FULLERTON, CALIFORNIA * 92634 I N T E R N A T I O N A L S U B S I D I A R 1 E S : G E N E V A ~M U N I C H ; G L E N R O T H E S SCOTLAND; TOKYO; PARIS; CAPETCWN; L O N D O N ; WEXICO CITY

Circle NO. 200 on Readers' Service Card

162 A

e


I.YSTRL ME.\ TS C O R €

3803.05 N. FIFTH STREET PHILADELPHIA, PENNSYLVANIA 19140 'HONE: 215.228-7417 9 CABLE: "PPICO" Ii'ORLD Ii'ZUE S A L E S A S D S E R I ' I C E

Circle NO. 85 on Readers' Service Card

MANUFACTURERS' LITERATURE "Temperature Test Chambers and Bccessories" presents the company's line. Included are specification data, reference charts to summarize features of individual chambers, and a temperature conversion chart. Statham Instruments, Inc., 12401 West Olympic Blvd., Los Angeles, Calif. 90064. 61 5

Temperature Test Chambers.

Nuclear

Instrumentation

Atomic Absorption Supplies. Bulletin

82-1987-68, 8 pages, proT-ides complete descriptive information, prices, and ordering information of 12 different standard solutions, more than GO singleor multiple-element hollow cathode lamps, and other supplies for atomic absorption spectroscopy. Beckman Inbtruments, Inc., 2500 Harbor Blvd., Fullerton, Calif. 92634. 622

GC supplies

Supplies.

Bulletin 81, 16 pages, provides inforniation on liquid scintillation and planchet counting systems. Beckman Instruments, Inc., Scientific Instruments Division, 2500 Harbor Blvd., Fullerton, Calif. 92634. 616 Cryogenic Refrigeration Systems.

A

35-page booklet describes closed-cycle, plug-in cryogenic refrigeration systems suitable for permanent laboratory installation. The systems make refrigeration to 4.4' K a laboratory utility similar to gas, vacuum, or electricity. Air Products and Chemicals, Inc., P. 0. Box 538, Allentown, Pa. 18105. 6 1 7 Chromatography Manual. B 3G-page manual gives information on procedures, apparatus, and applications of thin layer chromatography : analytical, preparative, micro, and instant. A description of a thin layer electrophoresis cell is also included. Gelman Instrument Co., GOO South Wagner Rd., P. 0. Box 1448, Ann Arbor, Mich. 61 8

Four pages present information on principlee of operation and applications of silicon surface barrier detectors. The detector gives simultaneous signals linearly related to the energy and position of impacting alphas, tritons, proton, and electrons. Kuclear Diodes, Inc., P. 0. Box 133, 623 Prairie T'iew. 111. 60069. Nuclear Triode.

An 8-page booklet introduces Sephadex G-25 and G-50 Medium, new grades in bead form offering high flow rates combined with good resolution. The material consists of three-dimensional networks of polysaccharide chains. Pharmacia Fine Chemicals, Inc., SO0 Centennial Are., Piscataway, N. J. 08854. 624 Supporting Media.

Bulletin T'-1270, 2 pages, describes the company's automatic viscometers and viscosity control systems. Bulletin T'1260, 4 pages, presents viscosity conversion tables. Sorcross Corp., 255 Newtonville Aye., Xewton, 1Iass. 02158. Viscosity

Measurements.

625

=In 8-page brochure describes the Model 2G-212A process chromatograph. The instrument can monitor 8 separate gas or liquid streams with readout on as many as 9 components or component concentration ranges. Process Analyzers, Inc., 5405 Griggs Rd., Houston, Texas 7 i 0 2 1. 619 Process Chromatograph.

Catalog 67 contains 381 pages describing scientific glassware and apparatus. Division I contains laboratory glassware : accessories and equipment are listed in Division 11. Free copies are available by writing on company letterhead t o Ace Glass, Inc.. Tineland, N. J. 620 Glassware.

Biomedical Research Chemicals.

A .

16-page brochure lists and describes more than 325 polyamino acids, polypeptidyl proteins, peptides, and related amino acid derivatives useful in biomedical research. Miles Laboratories, Inc., Elkhart, Tnd. 62 1

Viscometer System.

9 12-page folder-

bulletin describes, pictures, and gives specifications of the Ferranti-Shirley viscometer system. Ferranti Electric, Inc.. East Bethpage Rd., Plainviev-, S.Y . 11803. 626 Stable Isotopes. A 12-page price list gives information on KLIR solvents, deuterium labeled compounds, deuterium oxide, deuterium gas, and compounds enriched with nitrogen-15, carbon-13, oxygen 17, and oxygen-18. Biorad Laboratories, 32 &- Griffin ..lve., Richmond, Calif. 94804. 627 Gas Chromatograph. Described in an 8-page bulletin is the Model 2100 gas chromatograph. The instrument offers reliable operation at 300" to 400' C ; manogram concentration range, and high column efficiency (600 plates/ foot). T'arian Aerograph, 2700 1CIitchell Dr., Walnut Creek, Calif. 94598.

Buy 'em from Beckman direct-order supply catalogs and get same-day-shipment on all of these off-the-shelf GC items: Qualitative Analytical Standards Quantitative Analytical Standards GC-IR Fraction Collector Columns Plumbing Items Column Fittings Recorder Charts

from the nearest of our coast-to-coast stockpoints. Direct-to-you delivery means you can now fill every need whenever you feel the need. And who knows your analyzer supply requirements better than the instrument manufacturer? Other catalogs list supplies for I R , UV, pH, Nuclear, Atomic Absorption, Aquameters & Titrators, Pumps & Fittings, Order the specific catalogs you need now and take advantage of special introductory offers. Contact your nearest Beckman office or write direct for Data File No. 1304E.

INSTRUMENTS, I NC. SCIENTIFIC INSTRUMENTS DIVISION FULLERTON, CALIFORNIA * 92634

628 Circle No. 203 on Readers' Service Card

VOL. 39, NO. 13, NOVEMBER 1 9 6 7

0

163 A

MANUFACTURERS’ LITERATURE Detector Systems. Bulletin 6701, 6 pages, gives detailed information on the company’s micro detector sjatems for gas chromatography, Included are details on a new solid-state power supply incorporated into the control unit for all standard thermistor, high temperature thermistor, and ultrabead detectors. Carle Instruments, Inc.. 532 South Rose St.. Anaheim, 629 Calif. 92805. Micro

V supplie

Chemical Catalog. L4 new catalog lists oi-er 6000 reagent and organic chemicals. Also included is a 30-page section liskng empirical formulas, appendixes of stains, indicators, Grignard reagents, Spectroquality solvents, gas chromatography chemicals, etc. Ace Scientific Supply Co., Inc., P. 0. Box 630 127, Linden, N.J. 07036. Electrophoretic Destainer. Technical Bulletin 137 provides operating instructions for the Model EC-489 electrophoretic destainer. E-C lpparatue Corp., 222 9. 40 St., Philadelphia, Pa. 631 19104

Buy ’em from Beckman direct-order supply catalogs and get same-day-shipment service on all of these off-the-shelf UV items: Cells (Cuvettes) Source Lamps Sample Containers Optical Filters Atomizer Burners Standard Solutions

Reflectance Supplies Recorder Charts Pens Ink Dust Covers Batteries

from the nearest of our coast-to-coast stockpoints. Direct-to-you delivery means you can now fill every need whenever you feel the need. And who knows your analyzer supply requirements better than the instrument manufacturer? Other catalogs list supplies for IR, pH, GC, Nuclear, Atomic Absorption, Aquameters & Titrators, Pumps & Fittings. Order the specific catalogs you need now and take advantage of special introductory offers. Contact your nearest Beckman office or write direct for Data File No. 1307E.

Flask Evaporators. Bulletin 653, 6 pages, gives performance data and specifications on rotating, thin-film-type flash evaporators and laboratory concentrators. Precision Scientific Co., 373T W, Cortland St., Chicago, Ill. 60647 632 Nitrate Ion Electrode. A 4-page data sheet discusses the Model 92-07 nitrate ion activity electrode for determining nitrate ion in aqueous solutions. Orion Research Inc., 11 Blacketone St., Cambridge, ICIass. 02139 633

INSTRUMENTS, INC. FULLERTON, CALIFORNIA * 92634 INTERNATIONAL SUBSIOIASIES GENEVA, MUNICH; GLENROTHES. SCOTL4U3: T3AYO: PARIS: CAPETC‘WN: L O N D O N ; MEXICO CITY

Circle No. 204

164 A

e



637 l o w Temperature Dry Asker.

A 6-

page folder presents diagrams, photographs, and specifications of the LTAGO0 low temperature dr\T: asher The iii3trument is designed to aid in elemental anal3 sis of organic samples Tracerlab, 2030 Kright -4-1 e , Rich638 mond, Calif Aerosol Photometers. An $-page bulletin (J1I-20OOA) describes a line of forward-scattering aerosol photometers for monitoring dust and smoke concentrations. Phoenix Precision Instrument Co., 3803 S.Fifth St., Philadelphia, Pa.

19140

639

Company Periodicals R e q u e s t s f o r copies of the f o l l o u h g publications, catalogs, etc.. skould be sent directly t o t h e address shown. Btisine8s or professional letterheads are requested, Gas-Chrom Newsletter. Vol. 8, KO,4. This 4-page issue announces some price cuts on high-quality chemicals, lists high-purity fatty alcohols available, and discusses methyl a-hydroxy ester GC mixtures. Applied Science Laboratories, Inc., State College, Pa. 16801.

T’ol. 11, Six pages of this issue provide a check-list of current literature covering research on essential oils, aromatics, etc. including a section on analytical methods. Fritzsche Brothers, Inc., 76 S i n t h Ave., S e w Tork, 1. T. 10011. Fritzsche Library Bulletin.

TLC Techniques. An S-page bulletin describes the use of the company’s Chromagram sheets in thin layer chromatography. Distillation Products Industries, Rochester, S.Y. 14603. 634

An 8-page brochure describes multi-channel finger pumps in various sizes and kinetic clamp pumps for use in laboratory operations. Sigmamotor. h e . , 3 SOrth Main St., IIiddleport. S.Y. 14105. Laboratory Pumps.

635

Gas

SCIENTIFIC INSTRUMENTS DIVISION

Symbols. 4 n 8-page folder lists all the scientific, technical, and mathematical s>mbols available for use on all t3penriters. An adapter is used with portable and small electric machines. AIechanical Enterprises, Inc . 312i Colvin St., Alexandria, T’a. Typewriter

Chromatography

Equipment.

Bulletin 3010-DB 8-2, 8 pages, presents information on the Series 5000 SelectaSystem gas chromatography equipment. Barber-Colman Co., Rockford, 111. 636

S o . 8-9.

T’ol. 8, N o . 4. This 12-page issue discusses gas chromatography as used in detecting and identifying diluents in crankcase oil and characterizing lead alkyls in petroleum products. Xlao included are articles on selecting solvents for osmometry and electronics for chemists. HewlettPackard, Route 41 and Starr Rd., Avondale, Pa. 19311. Facts & Methods.

T’ol. VI, No. 2. Principal articles in this 24-page i-:>-ue are entitled: Thin Layer Chromatography

Solutions.

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B & 1 Atomic Absorption Spectrophotometer

SuDDlies 3 W

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Single Beam, Double Grating Spectrophotometer Unique Power Supply & Multiple Lamp Housing Remote Ignition System Choice of Readouts Designed for Easy and Convenient Operation Readily converted for Flame Emission or Absorption Write or phone for Model AC-2-20 Brochure

Angstrom, Inc. P. 0. Box 256, Belleville, Mich. 48111 Area Code 313-697-8058 Circle No. 23 on Readers' Service Card

Buy 'em from Beckman direct-order supply catalogs and get same-day-shipment on all of these off-the-sheif IR items: Liquid Sample Cells Gas Sample Ceiis K B r Dies Variable Path Length Cells Th rowahay Cel Is Variable Temperature Accesscry Micro Cells

-

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APPLl CAT IONS Air Pollution Studies ozone~~~~~~i~~ ~~~i~~~

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Trace Gas Measurement Lab Gas Analyses I

wri@{ Descriptive

Bulletin

Won't contaminate or destroy chemically active gases because gas-contacting parts are Teflon* reinforced with 15% glass fiber and no lubrication is required. Pumps inert gases without contaminating them. Offers approx. 200 ml/rnin. flow rate (non-adjustable), Flow rate is constant within =1.5% of mean value. Develops pressure or suction equivalent to a 3-inch column of mercury i n normal operation. Performs dependably at atmospheric pressures from sea level to 2 mbs. 1s operated by a 6V d.c. motor having a governed speed of 2400 r.p.m. *Du Pont Reg. T.M.

ience Pump Corporation 1431 Ferry Avenue, Camden, N. J. 08104 Phone: (609) 963-7700

Beam Condensers Linearity Discs Beam Attenuators Hydraulic Presses Wedge Dies Reccrder Cnarts Windcw Polishing Kit Pellet Holders

from the nearest of our coast-to-coast stockpoints. Direct-to-you delivery means you can now fill every need whenever you feel the need. And who knows your analyzer supply requirements better than the instrument manufact u rer? Other catalogs list supplies for pH, UV, GC, Nuclear, Atomic Absorption, Aquameters &Titrators, Pumps & Fittings. Order the specific cataiogs you need now and take advantage of special introductory offers. Contact your nearest Beckman office or write direct for Data File No. 1308E.

INSTRUMENTS, INC.

SCIENTIFIC INSTRUMENTS DIVISION FJLLERTON, CALNFORNIA e2634 'UTE2EI4- 3'1). SL6SlCl&9l!S 2C_I.Z\'?, %J: C k , 'GL!'\2ZTqrS, S C C T L P Y 3 T 3 0 3 . " P a S CASETCn;i LOhCCI!, b'EXIC0 ZITI

Circle No. 188 on Readers' Service Card VOL. 39,

Circle No. 199 on Readers' Service Card NO. 13, NOVEMBER 1967 e 165 A

MANUFACTURERS’ LITERATURE Identification of Pesticides Using DipCoated Presensitized lIicroscope Slides ; Thin Layer Electrophoresis on an Adsorbent-Impregnated Medium; and High Voltage Electrophoresis as an Analytical Tool. Gelman Instrument Co., P. 0. Box 1418, Ann Arbor, hIich. 48106. Vol. 2, KO,5 , Methods of measuring the rate of change of one yariable with respect t o time are discussed in this 4-page issue. McKee-Pedersen Instruments, P. 0. Box 322, Danville, Calif. 94526. MPI Application Notes.

Vol. 23, S o . 1. This %-page issue contains articles on plasma physics, measuring turbidity in colored solutions, simultaneous analysis of two-component systems by phosphorimetry, pollutionmonitoring device, automated pharmacmtical assay system, studies of hydrocarbon burning in car engines, and gas chroniatography studies a t the University of Utah. American Instrument Co., Inc., 8030 Georgia Aye., Silver Spring, N d . 20910.

Aminco Laboratory News.

Dust Topics. T’ol. 4, KO. 3. This 16page issue presents articles on the identification of microorganisms isolated from jet fuel systems and on a standard method for particle size determinations. Gelman Instrument Co., 600 South Wagner Rd., P. 0. Box 1448, Ann Arbor, Mich. 48106.

with the NEW Bausch %t Lomb Concentration Computer Gone are the days of involved calculations, checking tables or figuring formulas. Today, if you want to h o w the concentration of a solution . . . read it! Just attach the new Bausch & Lomb Concentration Computer to your spectrophotometer. Most B&L Spectrophotometers attach directly, several other makes are easily adapted. Now the whole job boils down to three quick steps: 1. Set zero. 2. Calibrate to a known standard. 3. Read the unknown concentration directly. Simple. . . Fast. . . Accurate! The price is just $750 , . . making this the fist and only low cost unit that automatically reads concentration directly for any solution obeying Beers law. We’ll gladly send you a descriptive brochure (33-2215) or why not let us show you? Write Bausch & Lomb, 60947 Bausch Street, Rochester, New York 14602. P.S. W a n t t o know about our full line of spectrophotometers? Just ask us.

BAUSCH & LQMB

0

Via. To1 1, No. 2. This 20-page issue introduces the T-60 K X R spectrometer and other neiv instruments and includes information on books, conferences, and courses in analytical instrumentation. T’arian, Analytical Instrument Division, 611 Hansen R a y , Palo Alto, Calif. 91303.

Vol. 2, KO. 4. This issue features an article on the importance of sensitivity and specificity in fluorescence measurements, abstracts of papers presented at the University of Maryland-Aminco Symposium on Fluorescence, and regular features. bmerican Instrument Co., Inc., 8030 Georgia Aye., Silver Spring, Md. 20910. Fluorescence News.

Research Notes. Summer 1967. This 8-page issue contains articles on gas chromatography of amino acids, column technology, quantitative analysis, and biomedical instrumentation. Varian Aerograph, 2700 Rlitchell Drire, Walnut Creek, Calif. 94598. +Circle

+See

No. 30


ACS laboratory Guide for All Products/Sales Office

DON’T BE HIGH PRESSURED INTO BUYINGA LOW PRESSURE VARIABLE SPEED PUMP

Operating a t pressures t o 50 psi, the Model 300 metering pump w i l l deliver a reproducible, essentially non-pulsating f l o w within -i- 2% of t h e dialed-in rate, easily outperforming lower pressure peristaltic or similar variable speed pumps. The Model 300 has a pumping range continuously variable f r o m 0 t o 500 ml/hr, is self priming, and does not require any preliminary calibration. Almost a l l liquids can easily be accommodated. For complete details write f o r brochure MPSlK.

1scoINSTRUMENTATION SPECIALTIES COMPANY, INC. 5624 SEWARD AVE.

PHONE 1402) 434-8265 CABLE ADDRESS: ISCOLAB LINCOLN

LINCOLN, NEBRASKA 68507. U.S.A.

Circle NO. 147 on Readers’ Service Card

See ACS Laboratory Guide for All ProducWSales Office

PO R TA B L E T H E R M 0 E IE C T R 1 6

IMMERSION COOLER cools liquid in laboratory baths You can lower temperature, even produce sub-zero temperature, in laboratory baths with the compact, space saving portable Eberbach Immersion Cooler. It operates on the Peltier effect in semiconductor thermocouples. When direct current of proper polarity is applied to the thermocouples, heat is extracted from the outer metal shell and moves to the central heat sink from which it is removed by a flowing coolant (tap water). Direct current is supplied by the Power Supply Unit shown, which operates from 1 1 5 volt, 5 0 / 6 0 cycle input, drawing 165 watts. Thermal pumping rate is 1 7 5 BTU per hour when bath and coolant temperature are the same. Catalog No. 9900 Thermoelectric Immersion Cooler Assembly with DC Power Supply, 115 volt 50160 cycle , $250.00

......

P.0. BOX

1024

ANN ARBOR, MICHIGAN 48105


See ACS Laboratory Guide f o r All Products/Sales Office

L

0 1

Trace analyses? Highest purity? Low blanks?

% HYDROXYLAMINE HYDROCHLORIDE!

I

Is)

Maximum Impurities-Iron: Copper: 0.1 ppm.-Nickel:

0. I ppm. 0.1 pprn.

MAG-JET:.

8

THE FIRST IMMERSIBLE MAGNETIC STIRRER

1

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MASS SPECTROMETRIC ANALYSIS Thln fllms-solid state materials.

Bulk and trace analysis of all solid materlais. Concentration gradlents of diffused impurities. Resolution 5000.

MAG-JETis a low cost magnetic stirrer that can be immersed with complete safety, in your own bath. Requires no electricity. . operates on water pressure, air pressure or equivalent vacuum. MAG-JETis a compact, enclosed turbine, made of sturdy cast aluminum with an impeller that rides in jewelled bearings, BRONWILL No. 26 MAG-JET, with stirring bar , . . , 16.95 each

.

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INDEX TO ADVERTISERS IN THIS lSSUE

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"Eastern Industries. Hepler & Gibney qEberbach Corp.. Drury, Lacy, Inc. Electronic Associates, Inc.. Gaynor & Ducas, Inc. Engelhard Industries, Inc.. Keyes, Martin & Co. Engelhard Industries, Inc., Baker Plati. num Div.. Keyes, hlartin & Co. Engis Equipment Co.. Stevens, Kirkland, Stabelfeldt, Inc. Eon Corporation.. Molesworth Associates Carlo Erba. Publicitas

*Ace Glass Inc.. Heller C;eative Advertising *Advanced Instruments, Inc.. 162 Tech/Reps Inc. Aerovac Co&. Mohawk Advertising Co. 24 Wm. Ainsworth & Sons, Inc.. Tallant/Yates Adv Inc. 'Alconox, Inc.. 156 Miller Advertising ,Agenw Inc. Allied Chemical Corp., Inddstrial Chemicals Div...

A simple adaptation to convert commercial automatic titrators to

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