PITTSBURGH EXPOSITION OF MODERN LABORATORY

PITTSBURGH

EXPOSITION OF MODERN LABORATORY EQUIPMENT F e b r u a r y 2 2 to

2 5

T h e E x p o s i t i o n at t h e P i t t s b u r g h C o n f e r e n c e on A n alytical C h e m i s t r y and A p p l i e d S p e c t r o s c o p y will include b o o t h s on t h e f o u r t h , C l u b and s e v e n t e e n t h f l o o r s of t h e P e n n - S h e r a t o n H o t e l . T h e E x p o s i t i o n will be o p e n t o all i n t e r e s t e d p e r s o n s w i t h o u t c h a r g e

ACE GLASS, INC. Vinelcmd, N. J. 0 8 3 6 0

Exhibiting: Trubore stirrers with Tef lon-clad rods: new sizes of Instatherm coated laboratory apparatus; complete distillation apparatus with all Tefloncoated joints and stopcocks for vacuum distillation without grease. ACS SCIENTIFIC SUPPLY CO., INC. 1420 E. Linden Ave. Linden, N. J.

Exhibiting: Vacuum gauge; spectro photometer, UV and visible with atomic absorption; ultra-pure zone re fined chemicals 09.99%: Precision vac uum pumps; DCL metering pumps. ACTON LABORATORIES INC. Scientific Instrumentation Div. 531 Main St. Acton, Mass. 0 1 7 2 0

Exhibiting: Electron microanalyzer.

probe

x-ray

W M . AINSWORTH & SONS, INC. 2151 Lawrence St. Denver, Colo. 80205

Exhibiting: Balances; Tvpes SCN, ION, 21N, 23N, 24N, all digital single pan balances: 2-pan balances and vac uum recording balances. ALLIED CHEMICAL CORP. General Chemical Division 4 0 Rector St. New York 6, Ν. Υ.

Exhibiting: Instrument grade solvents, reagents and C.P. acids, electronic grade chemicals, Harleco specialty re agents, Eastman organic chemicals, and Cominco ultra-pure metals. Circle No. 177 on Readers' Service Card

ALPHA SCIENTIFIC LABS, INC. 9 4 0 Dwight W a y Berkeley, Calif. 9 4 7 1 0

tus; Titra-Thermo-Mat, for routine therinometric applications (employs Meniseo-matic buret which indicates volume of titrant delivered) ; serial diluter with automatic filling device; chloride titrator with milliequivalent readout attachment ; grating rnonoehromator; new automatic UV ana lyzer (for indication and printout of ab sorption, transmission, and concentra tion of samples with wavelength from 200-S00 π\μ. Sliced of assay 3600 samples per hour) ; Aecumelt (provides melting and boiling points rapidly) ; French pressure cell and hydraulic press; peristaltic pump; atomic-fluo rescence.

AMERICAN INSTRUMENT CO., INC. 8 0 3 0 Georgia Ave. Silver Spring, M d . 2 0 9 1 0

AMERICAN MINECHEM CORP. P. O. Box 231 Coraopolis, Pa.

Exhibiting: Combination thcrmogravimetric analyzer and thermoanalyzer with effluent analyzer; Roller particle size analyzer; automatic mercury porosimeter; surface area meter; Adsorptomat—automatic determination of ni trogen adsorption-desorption iso therms; carbon-hydrogen analyzer for rapid submicro determination of car bon-hydrogen ; flnoro-microphotometer —a direct reading filter fluorometer— companion to spectrophotofluorometer; spectrophotofluorometer for fluores cence, phosphorescence, and transmis sion studies; new accessories are for en zyme studies, flow cells, thin film scan ner transmission studies, gas cell, two dimension scanning and numerous other attachments; light-scattering microphotometer; new micro freezing point depression analyzer; Britton Chance spectrophotometer with oxygen elec trode, side illumination attachment and ultraviolet attachment, rapid mixing chamber; new rotary Kjeldahl appara

Exhibiting: calorimeter.

Ga'lenkamp

AMERICAN Instrument Eggert and Buffalo 15,

OPTICAL CO. Division Sugar Rds. Ν. Υ.

ALOE SCIENTIFIC Division of Brunswick Corp. 1831 Olive St. St. Louis, Mo. 6 3 1 0 3

Exhibiting: Sensaur vacuum pump, Sartorius balances, IL pli meters, Pre cision Speegrav Rinco evaporator, ColePalmer strip and pilot box, Dow Corning hand cream and stopcock grease, Sensaur lab mixer, Spectrum lab lite, Trident cuvettes, and other Trident and Spectrum products.

Autobomb

Exhibiting: Concentrimetcr and other hand rcfractomctcrs; phase contrast microscope and accessories ; dual view ing compound (Series 10 Microstar) microscope. AMERICAN SOCIETY FOR TESTING AND MATERIALS 1916 Race St. Philadelphia, Pa. 19103

Exhibiting: A.S.T.AI. publications on spectroscopy, analytical chemistry, and related subjects. ANALABS, INC. P. O. Box 5215 Hamden, Conn. 0 6 5 1 8 VOL. 38, NO. 2, FEBRUARY 1966

•

103

A

MAKE YOUR ESR/NMR COMPLETE with the jeol

RA-1

SPECTRUM ACCUMULATOR nost

PITTTBURGH EXPOSITION

Exhibiting: Solid supports, solid adsorbents, polyesters, stationary phases, packed columns, coated packing, and accessories for gas chromatography ; adsorbents for thin layer chromatography. ANALTECH, INC. 100 South Justison Street Wilmington, Del. 19801

Exhibiting: Uniplate, pre-coated thin layer chromatography plates; automatic programmed zone melter, x-ray fluorescence camera. QUICKFIT REEVE ANGEL CO., INC. 9 Bridewell Place Clifton, N . J . 0 7 0 1 4

Exhibiting: Complete line of Whatman Chromedia products, including SG-81 silica gel loaded paper, AH-81 aluminum hydroxide loaded paper, silica gels, micro granular celluloses, ion exchange celluloses, nonionic celluloses and thin layer chromatography celluloses. ANGSTROM, INC. 2 4 5 4 W . 38th St. Chicago, III. 6 0 6 3 2

Exhibiting: Labtester, a low cost optical emission direct reader; spectrochemical sample preparation accessories including disc mills, No. 4500 briquetting press and Handy-Kaps ; the new carbomatic rapid carbon analyzer; T E power supplies and plasma jets. A 4096 channel, program-stored, digital device — compatible w i t h your present ESR/NMR system — providing signal-to-noise enhancement at high resolution . . . PLUS • • • • • • • • • •

Exhibiting: Cary laser Raman spectrophotometer; circular dichroism accessory for Cary spectrophotometers; Cary UV-VIS-NIR spectrophotometers and accessories; Atlas-MAT Model CH 4 mass spectrometer with double ion source for simultaneous mass spectrometry-gas chromatography analyses ; Models GD-150 and AMP3 mass spectrometers.

Integration Smoothing Theoretical calculation of NMR spectra Theoretical calculation of ESR spectra Calculation of 2nd order moment Differentiation Addition Subtraction Fourier transformations Correlation functions

ALL for the cost of an ordinary 1024 accumulator!

jeol PITTSBURGH

JEOLCO (U.S.A.), INC. · 4 5 1 Riverside Ave., M e d f o r d , M a s s a c h u s e t t s 0 2 1 5 5 - ( 6 1 7 ) 396-8620 · 828 M a h l e r Road, B u r l i n g a m e , C a l i f o r n i a 9 4 0 1 0 - ( 4 1 5 ) 697-9220

CONFERENCE

Circle No. 103 on Readers' Service Card

104

A

•

ANALYTICAL CHEMISTRY

APPLIED PHYSICS CORP. 2 7 2 4 South Peck Rd. Monrovia, Calif.

BOOTH

F105-106

APPLIED RESEARCH LABORATORIES, Inc. 3 7 1 7 Park Place Glendale, Calif. 9 1 2 0 8

Exhibiting: Latest ARL developments in x-ray fluorescence, electron microprobe, and optical emission spectrochemical instrumentation ; spectrograph^ analyzer, the low-cost package spectrochemical laboratory for industry and universities. APPLIED SCIENCE LABORATORIES, INC. P. O. Box 140 State College, Pa. 16801

PITTSBURGH EXPOSITION Exhibiting: Gas chromatography sup plies, thin layer chromatography sup plies, high purity lipids. ASSOCIATION OF CONSULTING CHEMISTS AND CHEMICAL ENGINEERS, INC. 501 Fifth Ave. New York, Ν. Υ. 1 0 0 1 7

POSITIVELY NO OTHER ESR . . . gives you guaranteed sensitivity of ΙχΙΟ'ΆΗ

Exhibiting: Clearing House for Con sultants—Slides and a M a p ; the 18th Edition of "Consulting Services,"—a permanent vinyl loose-leaf binder con taining the names of the leading chem ists and chemical engineers, fully crossreferenced with a subject "classifier" containing 300 technical, legal, and com mercial subjects in which our members specialize and qualify.

"-

.-Λ ~&M

,-*rT"~*^'-

AZTEC INSTRUMENTS, INC. 2 Silverbrook Rd. Westport, Conn. 0 6 8 8 2

Exhibiting: Complete line of Techtron atomic absorption spectrophotom eters and a full array of accessories in cluding hollow cathode, multiple cath ode, and high-intensity lamps, gas dis charge lamps, syringe pumps and burn ers; the Scientifica line of products for education and research including NMR and NQR; Scientifica counters; and Block Engineering infrared interferom eters. BAIRD-ATOMIC, INC. 3 3 University Rd. Cambridge, Mass. 0 2 1 3 8

Exhibiting: Model 1050 x-ray spec trometer, SD-1 densitometer, PD-1 stand, Spectrovac Model, 810C well counter, SF-1 Fluorispec, 630 spectrom eter, 550 Scintiscope. J. T. BAKER CHEMICAL CO. North Broad St. Phillipsburg, N. J. 0 8 8 6 5

Exhibiting: Complete line of labora tory organic chemicals, inorganic lab oratory reagent chemicals, a group of ion detection papers, chromatographic aluminas, and 99+ mol. spectrophotometric and chromatographic solvents. BARBER-COLMAN CO. 1300 Rock St. Rockford, III. 6 1 1 0 1

Exhibiting: Series 5000 Selecta-System gas chromatograph, Model 5340 and Model 5320 gas chromatographs, Model 5300 steroid analyzer, Model 5360 pesticide analyzer, radioactivity monitoring system, cryogenic tempera ture programming systems, pyrolysis attachments, and miscellaneous acces sory items.

. . . and unmatched resolution! The JEOL 3BS-X features a high-Q sample cavity which gives sensitivities presently unattainable in any other EPR equipment. The JEOL milligauss milligauss the finest

3BS-X features magnet homogeneity of w i t h i n 15 in a 1"Φ χ V2" air gap volume and within 7.5 over the sample area. It is capable of producing spectral splittings.

The JEOL 3BS-X has a Linear Field Sweep System associated with its low-impedance magnet and power supply. This system provides regulated linear sweep from low to high fields and accurate digital readout of magnetic field intensity.

jeol

JEOLCO (U.S.A.), INC. · 461 Riverside Ave., Medford, JE Massachusetts 02155-(617) 396-8620 · 828 Mahler Road, Burlingame, California 94010 - (415) 697-9220

W ^

PITTSBURGH

CONFERENCE — BOOTH

F105-106


VOL. 38, NO. 2, FEBRUARY

1966

•

105

A

PITTSBURGH

EXPOSITION

BARNES ENGINEERING CO. Instrument Division 3 0 Commerce Rd. Stamford/ Conn. 0 6 9 0 2

Exhibiting: Model PY-1 pyrolyzer with associated cells for transmission and reflection spectroscopy: accessories for attentuated total reflectance featur ing up to 20 reflections; variable tem perature chamber (—25° C to + 125° C.) ; complete line of infrared sampling cells and accessories.

DIAL YOUR FLOW RATE and Get Guaranteed ±0.5% Reproducibility

BARNSTEAD STILL & STERILIZER CO. 2 Lanesvilie Terrace Boston, Mass. 0 2 1 3 1

0.02 /il/day to 118 ml/day (255-3) 0.02 / i l / h r to 98 m l / h r (255-2) 0.005 /U/min to 29 m l / m i n (255-1) Sage Syringe Pumps are also available in models which offer a number of discrete rates. Pumps are designed for accurate, reproducible infusion of fluids with syringes ranging from 0.5 « 1 to 100 cc capacity. Pumps operate reproducibly re gardless of changes in back pressure or ± 1 0 % variations in line voltage. Whatever your application, you can count on Sage pumps to deliver dependable, accurate, and re producible performance. Each of the series types listed below is available in specific models to meet your particular flow rate range requirement. Write, wire or call for data or ask your Sage labware dealer for a demonstration. Constant Speed Models Series 234 ( 10 cc max.) $145 Series 249 (100 cc max.) $215 Variable Speed Models Series 237 ( 10 cc max.) $325 Series 255 (100 cc max.) $395

914

949-4121

Circle No. 147 on Readers' Service Card 106 A

•


Exhibiting: Environmental chambers; mechanical and gravity convection ovens ; constant temperature baths ; laboratory furnaces; incubators. BODER SCIENTIFIC C O . 8 1 0 - 8 1 4 Penn A v e . Pittsburgh, Pa. 15222

Exhibiting: Metallographs ; camera microscopes; research microscopes; routine microscopes; (made by Ameri can Optical, Reichert—Vienna, Leitz— Wetzlar, Zeiss—West Germany).

BAUSCH & LOMB, INC. 635 St. Paul St. Rochester, Ν. Υ. 14602

B R I N K M A N N INSTRUMENTS Cantiague Rd. W e s t b u r y , Ν . Υ. 11590

Exhibiting: Spectronic 505, Spectronlc 600 precision spectrophotometer, flame photometer, refractometer, monochromator, recorders, microscopes.

Exhibiting: Apparatus for thin-layer and preparative-layer chromatography including various new adsorbents, a new radiochromatogram scanner, and equip ment for thin-layer electrophoresis; Metrohm recording titrators, recording polarographic analyzers, and new digi tal piston burets; recording dilatometer with optional accessories for high-vac uum operation; DTA and TGA under vacuum; Lauda constant temperature baths and circulators for temperature ranges from - 1 2 0 ° to +330° C. and new Wenking potentiostats for electro chemistry ; Sartorius balances : analyt ical and precision balances ; featured will be new analytical models with Taramatic (mechanical taring) and automatic pre-weighing systems ; a complete new line of top-pan balances with capacities ranging from 160 grams to 10 kg.

Exhibiting: Infrared and ultraviolet spectrophotometers, atomic absorption analyzer, gas chromatographs, Electroscan 30, pH meters, radioactivity count ing systems, oxygen analyzers, labora tory recorder, and other analytical in struments. THE BENDIX CORP. Cincinnati Division 3625 Hauck Rd. Cincinnati, Ohio 4 5 2 4 1

Exhibiting: Model 3012 time-of-flight mass spectrometer, Model 1073 heated molecular leak inlet system including direct inlet, Model 1730 flame photom eter, Model 959 air particle collector. BETHLEHEM APPARATUS CO. Front and Depot St. Hellertown, Pa. 18055

Exhibiting: Glass working equipment; mercury cleaning equipment and servI ice; featuring new GL 25 glass lathe and new annealing oven.

SAGE INSTRUMENTS, INC. 2 Spring Street, White Plains, N. Y. 10601

BLUE M ELECTRIC C O . 1 3 8 t h a n d C h a t h a m Sts. Blue I s l a n d , I I I . 6 0 4 0 6

Exhibiting: Compact distilled water service for the modern laboratory; "Scale Arrestor" designed to eliminate sealing problems in water stills; high purity water stills; laboratory demineralizers.

BECKMAN INSTRUMENTS, INC. Scientific and Process Instruments Division 2 5 0 0 Harbor Blvd. Fullerton, Calif. 9 2 6 3 4 Continuously variable Sage Syringe Pumps permit you to pin-point the flow rate you want — at the setting of a dial. For example, selectable flow rate ranges for the 255 Series are:

Exhibiting: Model 200 interferometer spectrometer, Model 115 line discrimi nator, Model 300 Co-Adder computer, Model 150 UV-IR spectrometer.

BLOCK ENGINEERING, INC. 19 Blackstone St. Cambridge, Mass. 0 2 1 3 9

THE BRISTOL C O . W a t e r b u r y , Conn.

06720

Exhibiting: Dynamaster instruments: 7-inch recorder, high speed (0.2 second for 11-inch pen travel) recorder, con vertible multi-point recorder, electric Sclectomatie recorder, laboratory re corder, X-Y recorder, chromatograph recorder, extended range recorder, and transmittance/linear absorbancc re corder; Data-Master digital logger. BROOKS INSTRUMENT 4 0 7 W . V i n e St. Hatfield, Pa. 19440

CO., INC.

Exhibiting: Chromatography carrier gas control equipment including ELF

PITTSBURGH EXPOSITION

flow controllers, ELF needle valves, low flow meters. BURRELL CORP. 2 2 2 3 Fifth Ave. Pittsburgh, Pa. 1 5 2 1 9

Exhibiting: Gas chromatographs and accessories including pyrolyzer; wristaction shaker; instruments and solutions for gas analysis; instruments for rheology (rheometers, gelometer, thermal incline) ; Stanton laboratory balances including analytical, micro, thermal recording balances. CAHN INSTRUMENT CO. 1 5505 Minnesota Ave. Paramount, Calif.

Exhibiting: Vacuum balances and micro balances for TGA, adsorption studies and magnetic susceptibility; ultra-micro balances for elemental analysis and biochemistry; accessories for specific gravity and particle size measurement by sedimentation; automated balances. CANAL INDUSTRIAL CORP. 4 9 3 5 Cordell Ave. Bethesda, Md. 2 0 0 1 4

Exhibiting: Coulachron automatic titrator, wide-track 85 ultraviolet flow analyzers, Model M ultraviolet-visible spectrophotometer, back-track recorder-programmer, other equipment for instrumental analysis and research. CARLE INSTRUMENTS, INC. 532 South Rose St. Anaheim, Calif.

Exhibiting: Model 101 micro detector systems, solution fraction collector, pellet fraction collector, heated micro flow cell for GC-IR, complete line of sampling and switching valves, on-column inlets and other GC-IR innovations. COLEMAN INSTRUMENTS, INC. 42 Madison St. M a y w o o d , III. 6 0 1 5 4

Exhibiting: Complete new UV-visible spectrophotometer line including single beam, double beam ratio recording, research and routine typo; complete new pfl meter and electrode line including expanded scale, null balance, research and general purpose type pH meters; complete line of automated elemental analyzers for determination of nitrogen, carbon, hydrogen, oxygen.

FISHER ENDS CONTROVERSY VS. ATOMIC ABSORPTION WITH

EMISSION LOW-COST

MODEL EEL-140 Zinc in a flame at 2 0 0 0 ° K has seven light-emitting atoms but a thousand million million (10 1 5 ) light-absorbing atoms. The amount of light absorbed is proportional to the concentration of the absorbing element. This sensitivity alone demonstrates the superiority of atomic absorption spectrometry over emission methods for trace metal analyses. Consider, too, these facts about the new Model EEL-140 Atomic Absorption Spectrophotometer distributed by Fisher Scientific. · Simple to operate. · Determinations can be made in less than 15 seconds. · 100 determinations an hour of the same element are easy, with precision better than 1 % of the amount present. · Changing to another element can take less than 3 0 seconds. · Direct reading scale. · Compact, self-contained. At $ 2 , 8 5 0 , not including hollow cathode tubes, the Model EEL-140 costs far less than comparable instruments. This brings it within reach of analysts in agriculture, oil refining, quality control, mining, geology, clinical chemistry, forensic medicine and industrial toxicology. For free Bulletin 14-380, plus data on Atomic Absorption Standards, write Fisher Scientific Co., 100 Fisher Building, Pittsburgh, Pa. 15219. J-504

F CONSOLIDATED ELECTRODYNAMICS CORP. 3 6 0 Sierra Madre Villa Pasadena, Calif.

OVER NEW,

FISHER SCIENTIFIC CO. Instruments, Apparatus, Furniture and Chemicals for Laboratories

Complete stocks in all these locations: Atlanta · Boston · Chicago · Cleveland · Houston · New York Philadelphia · Pittsburgh · St. Louis · Union, N. J. · Washington · Edmonton · Montreal · Toronto · Vancouver See Buyers' Guide for all products/sales offices. Circle No. 92 on Readers' Service Card VOL. 38, NO. 2, FEBRUARY 1966 • 107 A

BîaSasisRVe

PITTSBURGH EXPOSITION CONSULTANTS BUREAU ENTERPRISES, INC. 2 2 7 W . 17th St. New York, Ν. Υ. 10011

Exhibiting: Books and journals on analytical chemistry and applied spec troscopy and related areas. COORS PORCELAIN CO. 6 0 0 Ninth St. Golden, Colo.

Exhibiting: Recrystallized alumina laboratory ware and tubes, chemical porcelain mullite tubes, metallographic mounting filler, filter disks, pulverizing and grinding equipment, porous ceram ics. CORNING GLASS WORKS Corning, Ν. Υ.

Exhibiting: pH Meters and electrodes, water stills, Corex laboratory ware, Pyrex laboratory ware. COULTER ELECTRONICS INDUSTRIAL DIVISION 2525 N. Sheffield Ave. Chicago, III. 6 0 6 1 4

Exhibiting: Particle size analysis equipment for sieve and sub-sieve size ranges; Industrial Model Β Coulter counter enables high speed particle size analysis for distributions and for con centrations; Model M attachment for data conversion eliminates data reduc tion. CRAWFORD FITTING C O . 8 8 4 East 140th St. Cleveland 10, Ohio

Exhibiting: Swagelok tube fittings for Vif/' through 1" o.d. tubing in a vari ety of machineable metals and plastics ; Strip Teeze Teflon tape: Swagelok slide valves; gas chromatograph fit tings ; Swagelok Quick Connect fittings and a selection of tube fittings and hy draulic and pneumatic components of particular interest to the field of gas chromatography. CRESCENT MANUFACTURING C O . 1 8 3 9 S . Pulaski Rd. Chicago, III. 6 0 6 2 3

Exhibiting: Wig-L-Bugs Models 3A— 5A and 6000 for small sample mixing, uniform particle size reduction in chem istry, metallurgy, and spectroscopy. DISTILLATION PRODUCTS INDUSTRIES Division of Eastman Kodak Co. Rochester, Ν. Υ. 14603

DOHRMANN INSTRUMENTS CO. 9 9 0 Varian St. San Carlos, Calif. 9 4 0 7 0

Exhibiting: Microcoulometric titrating system for microsulfur and halogen analysis; programmed temperature mi crocoulometric gas chromatograph for pesticide residue analysis; automatic membrane osmometer. E. I. du PONT de NEMOURS & CO., INC. Instrument Products Division Wilmington, Del. 19898

Exhibiting: Model 310 curve resolver; 410 precision photometer; 510 moisture analyzer; 900 thermal analyzers; 400 photometric analyzers. DURRUM INSTRUMENT CORP. 925 East Meadow Drive Palo Alto, Calif. 9 4 3 0 3

Exhibiting: Optical rotatory disper sion recorder (spectropolarimeter) ; circular dichroism recorder; rapid ki netic spectrophotometer (stoppedflow) ; multi-channel laboratory pumps; monochrome tors. EASTMAN KODAK CO. 3 4 3 State St. Rochester, Ν. Υ. 14650 THE EATON-DIKEMAN CO. Mt. Holly Springs, Pa. 17065

Exhibiting: Quantitative and qualita tive filter papers; chromatography and electrophoresis papers. EBERBACH CORP. P . O . B o x 1024 Ann Arbor, Mich.

Exhibiting: Electroanalysis appara tus; ultra speed electro analyzer; table model water bath shaker Dyna-Cath mercury cathode apparatus; recipro cating shakers Autofractor; automatic fraction collector; stirring apparatus; portable differential thermal analysis apparatus (DTA). ELEC SER PRODUCTS, INC. 52 Minnehaha Boulevard Oakland, N. J. 0 7 4 3 6

Exhibiting: Double pass monochromater, pH stat, low cost UV, VIS, IR spectrophotometers. ELECTRONIC ASSOCIATES, INC. 1 85 Monmouth Parkway W . Long Branch, N. J. 07764

Exhibiting: PACE (precision analyti cal computing equipment) system for automatic processing of output data

Why poil our pH js smart desi I hi1· now L \ N glass e l e c t r o d e has been d i o p p e d on ils tip 25,000 times— just as it might if you let it fall into a beaker. It still works with full accuracy a n d s e n s i t i v i t y . No b r e a k a g e . W e ' v e strengthened it at a critical point, where most electrodes are fragile. Rugged e l e c t r o d e design is w h a t y o u ' d expect f r o m a c o m p a n y that's been making pH-sensitive glass electrodes for 30 years—longer than anyone now in business. We're continually improving pH glass formulations and technology. Our electrodes have excellent linearity in the presence of Na and Κ ions. Their gen erously packed internal elements allow exceptional stability and long life over a w i d e range of solution temperatures. They're equipped with the glass-elec trode connectors now popular in the lab pH field. Both measuring and reference elec trodes have exactly the same internal element construction, so that they de velop identical half-cell potentials no matter how the temperature changes. This balanced configuration prevents drift and uncertainty. To avoid uncertainty, specify L&N electrodes. Talk to y o u r lab supply dealer about them and their use w i t h other pH meters. Or let us send you the details and the name of the L&N lab oratory pH dealer nearest you. W r i t e : Leeds & Northrup, 4906 Stenton Ave., Philadelphia, Pa. 19144.

n*

LEEDS

&

NORTHRUP

Philadelphia 44 · Pioneers in Precision Circle No. 97 on Readers' Service Card

fia*

1

NEW 36-PAGE CATALOG ON

STABLE ISOTOPES

PITTSBURGH EXPOSITION from analytical instrumentation; op erating demonstration will include gas ohromatograplis; typewritten reports of actual chromatographic analyses will be produced automatically in the booth. ENCYCLOPAEDIA BRITANNICA P. O. Box 4 9 2 8 Chicago, III. 6 0 6 8 0 FARRAND OPTICAL CO., INC. E. 238th St. and Bronx Blvd. New York, Ν. Υ. 10470

Exhibiting: Spectrofluorometer, fluorometer, and grating monochromator. FISHER SCIENTIFIC CO. 3 0 0 Fisher Bldg. Pittsburgh, Pa. 15219

Exhibiting: Model 310 expanded scale pH meter; super Flex-a-Mix stirrer; new additions to the Fisher pH elec trode line, DTA apparatus; photo metric model of the Titralyzer; ovens; and EEL atomic absorption spectro photometer; chemicals: atomic absorp tion standards, pesticide solvents, Clearsorb decolorizer, Dricote, pH buffers, and FL-70 biodegradable detergent. F & M SCIENTIFIC, DIV. OF HEWLETT-PACKARD Starr Rd. and Route 41 Avondale, Pa. 19311

Exhibiting: Model 185 carbon-hydro gen analyzer; Model 810 research gas chromatograph ; Model 776 Prepmaster, Jr. with double oven; Model 402 high-efficiency gas chromatograph ; Mechrolab osmometers.

OVER 700 ITEMS LISTED • The most complete catalog ever offered for biological and synthetic preparations labeled with stable isotopes. • Greatly expanded line. • Compounds labeled with nitrogen-15, carbon-13, oxygen-17, oxygen-18, and deuterium . . . many never before listed. • Comprehensive custom synthesis capabilities and mass spectrometer services. • Complete pricing, discount, pack aging and shipping information. To obtain your copy, please call or write:

I CSO RO M E Τ P O R A T I O N 4 3 3 COMMERCIAL. AVENUE

GENERAL ATOMIC, DIV. GENERAL DYNAMICS CORP. 10955 John Jay Hopkins Dr. San Diego 12, Calif.

Exhibiting: Activation analysis serv ice for high sensitivity determination of more than seventy elements down to p.p.m. and p.p.b. levels, evaluation of the applicability of activation analysis to clients' problems, plus course pro grams for training personnel in this ul tra-sensitive technique. GENERAL ELECTRIC CO. X-Ray Department 4 8 5 5 Electric Ave. Milwaukee, Wis.

Exhibiting: Programmed x-ray emis sion spectrometer with dual target tube and accessories.

PALISADES PARK, N E W JERSEY 201-944-4100

See Us at the Pittsburgh Conference Circle No. 95 on Readers' Service Card

110 A

•


GILFORD INSTRUMENT LAB., INC. 132 Artino Oberlin, Ohio

Exhibiting: Model 2000 multiple sample absorbance recording and indi cating spectrophotometer; Model 220 modular absorbance indicating and re cording spectrophotometer; Model 300 micro-sample spectrophotometer. GLOWALL CORP. 2 5 3 0 Wyandotte Rd. Willow Grove, Pa. 19090

Exhibiting: Model 310 medical and biomedical research gas chromato graph; Model 400 clinical gas chroma tograph, single oven with detector; Model 101 fraction detector for column chromatography. GOW-MAC INSTRUMENT CO. 100 Kings Rd. Madison 1 , N . J .

Exhibiting: Gas chromatography components and accessories, filaments of tungsten, rhenium, nickel, platinum, thermisters, detectors, hot wire and thermistors, gas density detectors, tem perature sensing tape, new Mini-Gade and new filament. GRAPHIC CONTROLS CORP. 189 Van Rensselaer St. Buffalo, Ν. Υ. 14210

Exhibiting: Recording charts. WILLIAM J. HACKER & CO., INC. P. O. Box 6 4 6 West Caldwell, N. J. 0 7 0 0 7

Exhibiting: Reichert : research polar izing microscope "Zetopan-Pol" ; rou tine polarizing microscope "RCP"; original Kofler hot and cold stages; original Kofler hot bench ; inverted uni versal camera microscope "MeF" ; lab oratory microscope ''Neopan" with the new 2 in 1 rapid focusing system. Linsois DTA apparatus: DTA for 1 or 3 sample testing: highly versatile; temperature ranges from —200° C. to +2200° C. controlled sample environ ment. Linseis TGA: electronic micro balance with simultaneous TGA/DTA; temperature ranges from —200° C. to +2200° C. ; controlled sample environ ment. HAMILTON CO. P. O. Box 3 0 7 Whittier, Calif.

Exhibiting: Precision measuring equipment, microliter syringes, chro matographic accessories, and the new probe and multipurpose sampling sys tems. THE HARSHAW CHEMICAL CO. Crystal-Solid State Division 1945 East 97th St. Cleveland, Ohio 4 4 1 0 6

PITTSBURGH EXPOSITION Exhibiting: IR and UV transmitting materials, x-ray analyzing crystals, and pressed pellet powders. HARTMAN-LEDDON CO. 60th and Woodland Ave. Philadelphia 4 3 , Pa.

Exhibiting: Volumetric solutions in Handi-Boy, volumetric concentrates, Karl Fischer reagent, sodium biphenyl for organic halogen, iodine, monochloride solution, and other prepared specialties. HEATH CO. Hilltop Rd. Benton Harbor, Mich.

49023

Exhibiting: 21-Specd all electronic chart drive unit; dropping mercury electrode apparatus; recording pH meter, polarography system.

A REVOLUTIONARY WASH ROTTLE ! NEW CONCEPT! NEW DESIGN !TW /~«v

J" ^

ψ0~-~"

HIGH PRESSURE DIAMOND OPTICS, INC. 9 2 9 Mackall Ave. McLean, V a . 2 2 1 0 1 HILGER & WATTS, INC. ENGIS EQUIPMENT CO. 8035 Austin Ave. Morton Grove, III. 6 0 0 5 3

Exhibiting: Three new spectrometer/ monochromators/spectrographs with direct reading, scan and photographic accessories designed to give the research facility maximum performance and flexibility. HONEYWELL, INC. 1100 Virginia Dr. Fort Washington, Pa.

19034

Exhibiting: ElectroniK 19, laboratory recorder; ElectroniK 16 laboratory re corders, chromatography recorders, laboratory controllers, trace signal am plifiers, signal conditioning equipment, high speed Visicorders, humidity and temperature controls, relay racks. HOTPACK CORP. Cottman and Melrose Philadelphia, Pa. 19135

Exhibiting: Complete line of all pur pose heavy duty lab baths, vacuum oven, Tru temp ovens and a completely redesigned high-temp furnace line. HOUSTON OMNIGRAPHIC CORP. 4 9 5 0 Terminal Ave. Bellaire, Texas 7 7 4 0 1

Exhibiting: OMNIGRAPHIC re corder which incorporates operating modes such as strip chart, XY, pro grammed, pulse input, and incremental

FILL

< The new N a l g e n e 5 Wash Bottle incorporates a revolutionary tech nique.* The dispensing tube is molded as an integral part of the polyethylene bottle. This unit con struction means the bottle can't leak! And, the tube extends to the very bottom of the bottle. Just s q u e e z e . D i s p e n s e to t h e last drop without tipping or shaking. M o r e f e a t u r e s ? The i n t e g r a l snap-on closure can't be lost—it's molded as part of the bottle. Large neck opening for easy filling—this wash bottle fills just like a regular bottle. Available in 125, 250, 500, 1000 ml sizes. Assortable with other Nalgene Labware for maxi mum discounts. Sound like the ideal wash bot tle? It is. Find out more from your lab supply dealer or write for our new 1966 catalog, Dept.1126, The Nalge Co., Inc., Rochester, New York 14602. *Pat. Pending

•:-i

V

NALGENE

LABWARE

NALGEN Another new product of Nalge Research

Leader in quality plastic labware since 1949


VOL. 38, NO. 2, FEBRUARY

1966

•

111

A


Àlew

chart. (All in one unit without addition or modification) ; XY recorders, logarithmic converters.

FwvtAce Duaft

HUNTER ASSOCIATES LABORATORY, INC. 9 5 2 9 Lee Highway Fairfax, V a .

Exhibiting: Instruments for color, whiteness, and gloss: D25 color difference meter with 45° 0° geometry for diffusely reflecting materials and sphere geometry for transparent, translucent, and metallic objects, direct readout of haze, turbidity, and yellowness, and direct-reading color difference computer; D45 citrus colorimeter for citrus juices and other liquids (reflecting or transmitting) ; D36 distinctness-of-image gloss meter for mirror quality of polished metals and high gloss paints and plastics; D40 reflectometer for white and near-white chemicals, pigments, paper, fibers, and for optical brightener evaluation. INFOTRONICS CORP. 7 8 0 0 Westglen Drive Houston, Texas 7 7 0 4 2

Penhet fit!

Ace Teflon-Clad Joints Provide the ultimate in no-freeze engagement Here is something new: Ace Joints are now available with cementable Teflon sleeves. These sleeves are rugged. You can use them "loose" instead of grease for non-vacuum applications. A series of slightly undercut glass inner members is offered for perfect fit with sleeves. Outer members feature our exclusive polished surface which does not wear the Teflon, fits better, lasts longer. For full information* on Ace Tef-Clad Joints, separate sleeves, epoxy, write Dept. A.

ACE GLASS I N C O R P O R A T E D Louisville,

Ky.,

Vinelafld

N .

J.

Circle No. 54 on Readers' Service Card 112 A

•


Springfield, Mass.

Exhibiting: Automatic digital integrators for gas chromatograph, amino acid analyzer and other analytical instruments; magnetic tape recording and integrating systems; digitizers for automatic peak height measurements, data acquisition for computers, and automatic readout of colorimet ers, spectrophotometers, etc. INSTRUMENTS, INC. P. O. Box 5 5 6 Tulsa, Okla. 74101

Exhibiting: Model C-40 gas chromatograph. ISOMET CORP. 4 3 3 Commercial Ave. Palisades Park, N. J.

Exhibiting: New x-ray analyzer crystals, electro-optic crystals, light modulators, stable isotopes, scintillation, and optical crystals. JEOLCO (U.S.A.), INC. Japan Electron Optics Laboratory Co.

461 Riverside Ave. Medford, Mass. 0 2 1 5 5

Exhibiting: JES-P-10 ESR radical detector, JNM-RA1 Spectrum Accumulator, JLC-2A liquid column chromatograph, JMS-Of II mass spectrometer. JARRELL-ASH CO. 590 Lincoln St. Walt ham, Mass. 0 2 1 5 4

PITTSBURGH EXPOSITION Exhibiting: Three models of atomic absorption instrumentation ; direct reading spectrometer; laser microprobe; Servomet, spark cutting ma chine; quantitative television micro scope; microphotometers; and 25-meter monochromators. JOHNS-MANVILLE CORP. 22 East 40th St. New York, Ν. Υ. 10016

«

«

Karl Fischer's made easy

Exhibiting: Supports for prep-scale chromatography ; high performance supports for biomedical applications; supports for gas chromatography. JONKER BUSINESS MACHINES, INC. 2 6 North Summit Ave. Gaithersburg, M d . 2 0 7 6 0

Exhibiting: Products and services for storing, retrieving, and correlating col lections of chemical, biological, and/or analytical data; Termatrex publications indexing infrared spectral data, x-ray powder data, and the gas chromatog raphy literature; complete line of Termatrex equipment. Κ & M MANOMETER CONTROL Box 3 1 1 1 Portsmouth, V a .

Exhibiting: Photoelectric pressure and vacuum control; Photoflo automatic buret. KAMAN NUCLEAR! Garden of the Gods Rd. Colorado Springs, Colo.

Exhibiting: Research microscopes, production S3rstem for on-line, control application.

New AUTO-AQUATRATOR gives you quick, automatic, accurate water determinations.

LAB-LINE INSTRUMENTS, INC. 15th and Bloomingdale Ave. Melrose Park, III. 6 0 1 6 0

H e r e in o n e c o m p a c t unit d e s i g n e d to h a n d l e any o r g a n i c or i n o r g a n i c y o u get the last w o r d in c o m p l e t e l y a u t o m a t i c w a t e r d e t e r m i n a t i o n s . T h e new P r e c i s i o n AUTO-AQUATRATOR " a u t o m a t e s " the s t a n d a r d Karl Fischer titration m e t h o d s to give y o u q u i c k , a c c u r a t e , and c o n s i s tent r e s u l t s — r e p r o d u c i b l e t o ± 0 . 0 2 5 ml of titrant. Either " d i r e c t " or " b a c k " titra t i o n s are readily m a d e by s i m p l y t u r n i n g a s e l e c t o r s w i t c h . No need to inter change solution bottles! T h e entire system is s e a l e d against a t m o s p h e r i c m o i s t u r e , a n d a built-in v a c u u m p u m p q u i c k l y removes any h u m i d

Exhibiting: Graphicorder-10 linear log; temperature controls; hygrom eters; centrifuges; fraction collectors; ovens; U.L. listed, explosion-proof refrigclamps; Temp-Blok module heater; and I.R. moisture analyser. LABORATORY CONSTRUCTION CO. 8 8 1 1 Prospect Ave. Kansas City, Mo. 6 4 1 3 2

Exhibiting: Fiberglass fume hoods, fiberglass glove boxes; laboratory carts. LABORATORY EQUIPMENT CORP. P . O . Box 151 St. Joseph, Mich. 4 9 0 8 5

Exhibiting: Two-minute oxygen ana lyzer, direct reading, 598-500 with printout attachment, direct reading

air f r o m the reaction vessel. For a c c u racy and m a i n t e n a n c e - f r e e o p e r a t i o n e a c h burette has its o w n e l e c t r o m a g n e t ic, glass-sealed valves. No d i a p h r a g m s or s t o p c o c k s . T h e r e are other i m p o r t a n t features, too, s u c h as automatic " e n d point h o l d " , a n d adjustable automatic transfer f r o m " c o n t i n u o u s f e e d " to " p u l s e f e e d " as the e n d point is a p p r o a c h e d . In short, the new A U T O - A Q U A T R A T O R has j u s t a b o u t everything f o r easy, a c c u r a t e , a u t o m a t i c operation. Ask y o u r Precision S c i e n t i f i c Distrib utor o r w r i t e for B u l l e t i n 642.

Since 1920 · The Finest in Quality Laboratory

P S

Apparatus SUBSIDIARY OF

PRECISION SCIENTIFIC CO.

GCA CORPORATION

3737 W. C o r t l a n d Street, C h i c a g o , Illinois 60647 L o c a l O f f i c e s in N e w Y o r k · C h i c a g o · Los A n g e l e s Circle No. 32 on Readers' Service Card VOL. 38, NO. 2, FEBRUARY

1966

•

113

A


TWO NEW PRODUCTS FROM ANALTECH

carbon (BOF and LD carbon range), automatic dosing device/ takes place of standard samples in gas analysis of metals; sample device for determining Ο, Η, Ν from steel baths. LEEDS & N O R T H R U P 4 9 0 1 Stenton A v e . Philadelphia 4 4 , Pa.

CO. M A L L I N C K R O D T CHEMICAL 3 6 0 0 N o r t h Second St. St. Louis, M o . 63160

E. LEITZ, I N C . 4 6 8 P a r k A v e . , South N e w York 16, Ν. Υ.

TLC Plates With Coatings Made

Exhibiting: Research microscopes, photomicrographic equipment and lab oratory micrographs.

From Microcrystal-

line Cellulose (AVICEL ) Circle No. 222 on Readers' Service Card

Exhibiting: Pulsed nuclear magnetic resonance spectrometers (spin echo) and accessories; iron core laboratory electromagnets, high regulation power supplies and magnetic field regulators, superconducting magnet systems; gaussmeters.

Exhibiting: Chroma-Kit for thin layer chromatography, Nanograde solvents for pesticide residue analysis, laboratory plasticware, SpectrAR for spectrophotometric solvents; AR chemicals. MATERIALS A N A L Y S I S

LKB I N S T R U M E N T S , I N C . 4 8 4 0 Rugby Ave. W a s h i n g t o n , D. C. 2 0 0 1 4

WORKS

CO.

81 Encina Ave. Palo A l t o , Calif.

Exhibiting: Model 9000 gas chromatograph-mass spectrometer; Model 8700 precision calorimetry system.

94301

Exhibiting: Model 400 electron microprobe analyzer. THE M A T H E S O N

COMPANY,

INC.

P. O. Box 85

UNIBARS

KURT J . LESKER C O . 5 6 3 5 Horning Rd. P i t t s b u r g h , Pa. 15236

9 3 2 Paterson Plank Road East R u t h e r f o r d , N . J .

Chromatographic Columns Made From TLC Absorb ents Circle No. 223 on Readers' Service Card

LIMIT RESEARCH C O R P . 5 5 7 Post R d . Darien, Conn.

Exhibiting: accessories.

Infrared and ultraviolet

LINDBERG HEVI-DUTY 2 4 5 0 W e s t H u b b a r d St. Chicago, III. 6 0 6 1 2

M A T H E S O N SCIENTIFIC, I N C . 8 9 2 0 Laisy A v e . Cleveland, Ohio 44104

LINEAR A L P H A , I N C . 8 2 3 Emerson St. Evanston, III. 6 O 2 0 1

*product of

FMC.

M A T R O N I C INSTRUMENT C O . 1 3 2 King Road Greater Wilmington Airport N e w Castle, Del.

LOENCO, INC. 2 0 9 2 N . Lincoln A v e . A l t a d e n a , Calif. 91002

Exhibiting: Analytical and prepara tive gas chromatographs, micro-volume and standard thermal conductivity de tectors, gas sample valves, liquid sample \-alves, multi-port switch valves, elec trometers. LOOMIS ENGINEERING &

MANUFACTURING CO. vale-Heppenstall Co.

ANALTECH, INC. 100 S. JUSTISON STREET WILMINGTON, DELAWARE

Pittsburgh Conference Booth F-35, 4th Floor 114

A

•


See Mid-

MACALASTER SCIENTIFIC CORP. 6 0 A r s e n a l St. W a t e r t o w n , Mass. 0 2 1 7 2 M A G N I O N , INC. 144 Middlesex Turnpike Burlington, Mass. 01804

Exhibiting: Standard gas mixtures for instrument calibration; helium puri fier; mass flowmeter; high purity gas pressure regulators, high purity, re agent grade gases in new style cylin ders; Criterio-Quality chemicals; Spectroquality solvents; technical pam phlet relating to solvents for spectros copy ; additional Chromatoquality chemicals,

Exhibiting: Complete line of low-cost gas chromatographs, including Model 500, manually programmed, Model 500 LTD linear temperature programmed, Model 575 flame ionization; Attach-APrep automatic universal preparative GC attachments. AI-150 syringe for automatic introduction of microliter samples into gas chromatographs; Model XL-500 pneumatic and electropneumatic column packing instruments. MCPHERSON INSTRUMENT CORP. 5 3 0 M a i n St. Acton, Mass.

01720

MELABS

3 3 0 0 Hillview Avenue Palo Alto, Calif.

PITTSBURGH

Exhibiting: Pulse polarographic ana lyzer, electrodeless conductivity meter, proportional temperature controller, linear temperature programmer, tem perature bridge. MET-BAY, I N C . 9 0 0 H a r r i s o n St. P . O . Box 6 1 0 Bay City, Mich. 4 8 7 0 9

Exhibiting: Emission spectrographic graphite electrodes, crucibles, funnels, and other graphite accessories. METTLER INSTRUMENTS 2 0 N a s s a u St. Princeton, N. J.

CORP.

Exhibiting: Substitution-type analyti cal and precision balances; Η types with digital readout: semi-micro and micro balances; and the ultra-micro TJM giving a precision of ±0.1 micro gram; Ρ series top-loading precision balances. M I C R O TEK I N S T R U M E N T S , P . O . Box 1 5 4 0 9 Baton R o u g e , La. 7 0 8 1 5

CO.

Exhibiting: Twenty-ton laboratory press with dies for forming KBr pellets; x-ray and spectrographic applications and other accessories; laboratory high pressure isostatic equipment.

Exhibiting: The Derivatograph, only thermogravimetric balance with four registration systems (DTA, TGA, DTG, and T) ; N.I.L.—Pungor direct reading electrodes; Atabel grating atomic ab sorption spectrophotometer; I.C.I.— Joyce particle size disk centrifuge; fly ing spot scanner for single crystal and Weissenberg patterns; J.L.C. doublebeam automatic recording microdensitometer, with computer input, data handling, reflectance and Isodensitracer; Chromoscan, scanning integra tor for thin layer chromatography and electrophoresis : Beroza carbon skeleton determinator, high pressure dialystat ; and flame photometer, with automatic digital readout and optional printer. NATIONALrSPECTROGRAPHIC INC. 6 3 0 0 Euclid A v e . Cleveland, Ohio 44103

LABS.,

Exhibiting: A complete line of emis sion spectrographic equipment includ ing excitation sources, microphotometers, plasma arcs, photoelectric scan ning equipment, and other accessories. NESTER/FAUST M A N U F A C T U R I N G CORP. 2 4 0 1 O g l e t o w n Rd. N e w a r k , Del.

Exhibiting: Summatic electronic inte grator, annular Teflon spinning band still, 850 Preperomatic, automatic dis tillation equipment, analytical gas chromatographs. NESLAB I N S T R U M E N T S , P. O . B o x Y D u r h a m , Ν . Η. 03824

INC.

NUCLEAR M A G N E T I C RESONANCE SPECIALTIES, I N C . 1 4 1 0 Greensburg Rd. N e w Kensington, Pa.

MILLIPORE FILTER CORP. Ashby Road Bedford, Mass. M I N E SAFETY APPLIANCES 2 0 1 North Braddock Ave. Pittsburgh, Pa. 15208

N A T I O N A L INSTRUMENT LABORATORIES, I N C . 1 2 3 0 0 P a r k l a w n Dr. Rockville, M d .

INC.

Exhibiting: GC-7500R Series II re search gas chromatograph; GC-2000R analytical gas chromatograph; MT-220 analytical gas chromatograph with thermionic flame; and high temperature electron capture detectors; ultrasonic gas chromatograph for trace analysis. MIDVALE-HEPPENSTALL Nicetown Philadelphia, Pa.

EXPOSITION

CO.

Exhibiting: Model 550 gas chromato graph, 525 programmer; Model 300 Lira infrared gas analyzer, and Portable Billionaire; diffusion head gas analyzer. NAMCO MACHINERY, INC. 5 4 Kosciusko St. Brooklyn, Ν. Υ. 11205

Exhibiting: Improved Unormatic Star Series glassware and bottle washing ma chine, and new table top model labora tory washing machine.

Exhibiting: Model PS-fiOA pulsed nu clear magnetic resonance spectrometer system Model HD-60B spin decoupling system, Model XQ-60B nuclear quadrupole resonance spectrometer system and NMR accessories.

Summatic integrator T h e S u m m a t i c I n t e g r a t o r is a n e w tool to a u t o m a t i c a l l y c o m pute and present on printed tape, in d i g i t a l f o r m , p e a k areas w h i c h a r e a f u n c t i o n of m a s s , c o n c e n t r a t i o n or s t r u c t u r e .

The Summatic Integrator i n c o r p o rates small peak accuracy, wide dynamic range and low cost. These three desirable requirements have not been available in competitively priced integrators until now. Nester/ Faust's Summatic assures you ot the following : I A u t o m a t i c count of each peak at a rate which gives approximately the same high statistical relia bility—regardless of peak height up to a maximum signal of one volt. II Proven and reliable voltage to frequency conversion t e c h n i q u e to convert the input signal to a number of pulses that is pro portional to the area. This t e c h nique in conjunction with a novel Auto-Ranging* device gives good statistics on small peaks (±3% on 100μν p e a k s of 3 seconds duration,) and a dynam ic range of 0 to 1 volt DC auto matically. Precision on larger peaks is about --0.7% for 20 mv peaks 10 seconds long. Ill Low cost since the S u m m a t i c ' s Auto-Ranger allows the use of a narrow range 0 to 1 mv stabilized amplifier, a narrow range Oto 100 cps voltage to frequency c o n verter, and a fast mechanical counter-printer that does not re quire provision for memory. The A u t o - R a n g i n g circuit attenuates the input signal by a factor of ten at 3 decades of signal amplitude f 1 , 10 and 100 mvj and directs the output from the converter to the next higher counting wheel in the counter-printer. PITTSBURGH CONFERENCE PAPER 137 "SUMMATIC

NUCLEAR SCIENCE & E N G I N E E R I N G CORP. P. O . B o x 1 0 9 0 1 Pittsburgh, Pa. 15236

Exhibiting: Model AM-1 Môssbauer effect spectrometer (constant acceleration) ; Model Β Môssbauer effect analyzer (constant velocity both with cryogenic accessories; a listing of over 90 Circle No. 143 on Readers' Service Card—

INTEGRATOR"

SEE IT AT BOOTH F-137

Electronic construction is all solid state for long life and reliability. The cost of the Summatic Integrator is under $2000. Write for full technical literature. Nester/Faust Instruments Products D i v i s i o n , 2401 Ogletown Rd.,Newark, Delaware. *Patents pending.

NESTER/

FAUST

PURE

Periodic Chart of the Atom δ The Welch Scientific Co.

MATERIALS

W i t h our high-purity materials we can help you eliminate one evasive variable haunting research projects: impurities. We stock a periodic chartful of elements and inorganic compounds spectrographically ana lyzed with the help of Spex

J* POWDER

STANDARDS.

An innovation in 1955, today's SPEC LAB SOP, often facilitated by


radioisotopes, over 600 carbon-14 labeled compounds; many radioactive sources and standards and the custom irradiation and associated radioisotope analytical services offered by Ν SEC. NUCLIDE CORP. 6 4 2 East College Ave. State College, Pa.

Exhibiting: Time-of-flight and radiofrequency mass spectrometers; selected components from the 12"-90° modular mass spectrometer. NUMEC INSTRUMENTS & CONTROLS CORP. Monroeville, Pa.

Four mesh sizes in a stack as free from metallic contamination as their immaculate appearance suggests.

Exhibiting: Surface area pore volume analyzer; air-displacement porometer; controlled potential mercury intrusion pore volume analyzer; surface area ap paratus; controlled potential coulometric titrator, Tap-Pak volumeter; surface area and density analyzer. OHAUS SCALE CORP. 1050 Commerce Ave. Union, N. J. 0 7 0 8 3

BORON CARBIDE MORTAR & PESTLE SETS If you absolutely must resort to phys ical labor, Boron Carbide is the ma terial for hand grinding: tough, inert, hard, mirror-finished with no bond ing agents, but under more average lab circumstances outdistanced by

MIXER/MILLS. The research literature of our field is generously sprinkled with testi monials in praise of these versatile electrical pulverizers which, in grindmanship, yield only to the

SHATTERBOX.^ This laboratory grinder makes fast work of the big, hard jobs, having earned its reputation as the unex celled workhorse. May we test grind a 100 ml sample for you, be it ce ment, slag, glass, minerals, fertilizer or such? No obligation, of course.

Our May, 1965 Catalog explains all.

SPEX

INDUSTRIES, INC. • METUCHEN, N. J. 08841 Circle No. 39 on Readers' Service Card

116 A

•


Exhibiting: Laboratory balances and weights; Autogram 1000 direct reading balance; Dial-O-Gram balances; all new full range, direct reading moisture determination balance; Unikit—appa ratus for teaching principles of chroma tography and electrophoresis on paper and thin layer ; line of triple beam bal ances with magnetic damping; and heavy duty solution balance. PACKARD INSTRUMENT CO. 2 2 0 0 Warrenville Rd. Downers Grove, III. 6 0 5 1 5

INC.

PARR INSTRUMENT CO. 211 53rd St. Moline, III.

Exhibiting: An automatic adiabatic oxygen bomb calorimeter and a com plete line of oxygen and sodium per oxide combustion bombs; laboratory pellet press; Series 4500 stirrer-type pressure reaction apparatus ; and a new line of small general-purpose bombs and autoclaves with volumes from 22 to 2000 ml. for pressures to 3000 p.s.i. and higher, and temperatures to 600° C. THE PERKIN-ELMER CORP. Main Ave. Norwalk, Conn. 0 6 8 5 2

Exhibiting: Infrared spectrophotom eters, ultraviolet spectrophotometers, polarimeters, atomic absorption spec trophotometers, electron spin resonance spectrophotometers, CHN analyzers, differential scanning calorimeters, gas

PITTSBURGH CONFERENCE PAPER 13B "SPINNING BAND DISTILLATION COLUMN" SEE IT AT BOOTH F-137

PITTSBURGH EXPOSITION chromatographs, sorptometers, spectrophotoflvioromcters, monochromators, mass spectrometers, x-ray diffraction equipment, amino acid analyzers, plus a wide range of accessories. PHARMACIA FINE CHEMICALS, INC. 800 Centennial Avenue Piscataway, New Market, N. J. 0S8S4

Exhibiting: Sephadex gel nitration media ; laboratorj" equipment. PHILIPS ELECTRONIC INSTRUMENTS 7 5 0 South Fulton Ave. Mount Vernon, Ν. Υ. 10550

Exhibiting: The latest in spectrographic and electron probe equipment will be displayed and demonstrated. PHOTOVOLT CORP. 1115 Broadway New York, Ν. Υ. 10010

Exhibiting: New photomultiplier photometer ; pH meters and electrodes ; double-beam, direct reading and ratio recording spectrophotometer for UV and visible range; improved Universal electrophoresis densitometer ; TLC densitometer; recorders and other lab oratory instruments. PICKER NUCLEAR DIVISION OF PICKER X-RAY CORP. 1275 Mamaroneck Ave. White Plains, Ν. Υ. 10605

Exhibiting: X-ray diffraction and fluorescence equipment accessories; SEM-2 microanalyzer; MS-10 mass spectrometer. PITCHFORD SCIENTIFIC INSTRUMENT CORP. P. O. Box 11668 Pittsburgh 2 8 , Pa.

Exhibiting: Special laboratory pulver izers, laboratory electric arc furnaces, optical microscopes and measuring equipment, x-ray spectrographs. POLYSCIENCE CORP. P. O. Box 65 Kenilworth, III. 6 0 0 4 3

Exhibiting: Analytical standards; Haake constant temperature circulators and viscosimeters and other scientific instruments. PREISER SCIENTIFIC, INC. 9 0 0 MacCorkle Ave. Charleston 2 2 , W . Va.

Exhibiting: Integrating digitizers for chromatography ; image expanders ;

spectrophotometers ; balances and other new developments in the laboratory field. PRESSURE CHEMICAL CO. 3 4 1 9 - 2 5 Smallman Street Pittsburgh, Pa. 15 201

Exhibiting: Mono-disperse polysty rene polymers of very narrow molecu lar weight distribution suitable for use as molecular weight standards; metal whiskers (single crystal fibers of metals and alloys for research).

-4

Sf

PROFESSIONAL TAPE CO., INC. 355 Burlington Road Riverside, III. 6 0 5 4 6

Exhibiting: Time pressure-sensitive tapes and labels; TSI (time sterile in dicator) autoclave tape; microscope slide labels. RANDAM, INC. 3091 Shadycrest Drive Cincinnati, Ohio 4 5 2 3 9

99 \1% HEI TAN

RINGSDORFF CARBON CORP. P. O. Box 22 East McKeesport, Pa. 15035

Exhibiting: A full line of spectroscopic graphite materials in rod and pre forms; crucibles and other carbons for metallurgical use.

048'

ItlKl

\ \

MILTON ROY CO. 1300 E. Mermaid Lane Philadelphia, Pa. 19118 SADTLER RESEARCH LABORATORIES, INC. 3 3 1 6 Spring Garden St. Philadelphia, Pa. 19104

Exhibiting: Infrared spectra, ultra violet spectra, nuclear magnetic reso nance spectra; differential thermal analysis, and infrared books. E. H. SARGENT & CO. 4 6 4 7 West Foster Ave. Chicago, III. 6 0 6 3 0 AUGUST-SAUTER OF AMERICA INC. 80 Fifth Ave. New York, Ν. Υ. 10011 Exhibiting: Scales and balances, capacifies of 1 mg., precision of 1 ^g. to capacities of 50 kg., precision of 5 m models for moisture determination, plus and minus weighing, special weighing problems in the food, oil, textile, paper, precious gems, metals industries, etc.; models have electronic output for type writers, printers, computers, punch card, or tape equipment, etc.; models Circle No. 2 on Readers' Service Card >•

\i

ι ι · ι ι · ι ι ι ι ι ι

Annular spinning Band Distillation column* for High Purity Separations Nester/Faust's new spinning band still e m p l o y s a Teflon band in annular configuration for high plate efficiency (in excess of 125 plates,), low h o l d - u p (0.3 m\) and low pressure drop (3 m m H g at 150 cc b o i l u p ) t o p r o d u c e previously unat tainable rectification. Separations recently made with the annular still included· f r o m β pinene at a p r o d u c t purity of better than 99%. Methyl esters of fatty acids t h r o u g h methyl oleate have been separated with individual purity of 99.5% and at a t h r o u g h p u t of 50cc/hour. The calibration m i x ture of 2 0 % heptane and 8 0 % methylcyclohexane (B.P. difference of 2.5°C>, s h o w n above, was separated at a purity of 99.52% heptane at a b o i l up of 30cc/hour. T h r o u g h p u t s of 450cc/hour are obtainable. W r i t e for t e c h n i c a l literature. N e s t e r / F a u s t Glass P r o d u c t s D i v i s i o n , 2401 Ogletown Road, Newark, Delaware. "U.S. and foreign patents p e n d i n g .

NESTER/ FAUST

THE SYMBOL OF EXCELLENCE SINCE 1 9 5 3

Distilled Λ Λ Λ Ι

Glass

SOLVENTS FROM BURDICK S JACKSON Purified to the exacting require ments of electron-capture gas chromatography. The list now numbers 30, and is still growing: Acetone Acetonitrile Benzene Butanol-1 Butanol-2 Butyl Ether Carbon T e t r a c h l o r i d e Chloroform Cyclohexane Dimethyl Formamide D i m e t h y l Sulfoxide Dioxane Ethyl Acetate Ethyl Ether " H e p t a n e " , 95-99° Hexane, 6 8 - 6 9 ° Isobutyl Alcohol Iso-hexanes, 5 9 - 6 3 ° Methanol 2-Methoxyethanol Methylene Chloride Methyl Ethyl Ketone /V-Methy I pyrrol i d o n e Neo-hexane, 4 9 - 5 0 ° Pentane Petroleum Ether, 3 0 - 6 0 ° Propanol-2 Tetrahydrofuran Toluene 2, 2, 4 - T r i m e t h y l p e n t a n e (Iso-octane), 9 9 - 1 0 0 ° Ask for Bulletin BJ-13J U.S. Agencies use F.S.S.

BURDICK & JACKSON L A B O R A T O R I E S , INC. 616 PA 2-2310 MUSKEGON, MICHIGAN 49442 Circle No. 78 on Readers' Service Card

118 A

•


PITTSBURGH EXPOSITION available with digital readout; models available with two-sided readout; T o p pan, Monopan, N o . 180, N o . 106, N o . 722, N o . 685. SCHUCO SCIENTIFIC Division o f Schueler & Co. 2 5 0 W e s t 1 8 t h St. New York, Ν. Υ. 1 0 0 1 1

Exhibiting: Glass water still, auto matic pipets, mirror burner, I l a a k e t h e r m o s t a t s a n d water baths, compact fraction collector, molecular models, M i j n h a r d t pulmonary function a p p a ratus, Cytolator, hematocrit centrifuge, semimicro glassware set, Sub-Zeromatic immersion coller, cuvette, washer. SCIENTIFIC GLASS APPARATUS CO., INC. 7 3 5 Broad St. Bloomfield, N . J.

Exhibiting: Corning H G - 1 still, Sartorius balances; precision diluter, Corn ing Model 12 p H meter, Scientific cells, Ohaus balances, Torsion balances, L a b line moisture analyzer balance. SCIENTIFIC INDUSTRIES, I N C . 2 2 0 - 0 5 97th Avenue Queens Village, N e w York

Exhibiting: C h r o m a t o g r a p h y acces sories, integrators, sulfur dioxide ana lyzer, mixing and shaking devices, gas analysis. SCIENTIFIC PRODUCTS Division o f A m e r i c a n H o s p i t a l Supply Corp. 1 2 1 0 Leon Place Evanston, III. 6 0 2 0 1

Exhibiting: I L p H and blood analysis equipment, T u r n e r fluorometers M e t t ler balances and other new instrumenta tion ; expendable plastic and glass prod ucts from the well known diSPo line. S H I M A D Z U SEISAKUSHO, LTD., ( M f r . ) R e p r e s e n t e d in U . S. b y A t o k a N e w Y o r k , Inc. ( D i s t r i b u t o r ) 6 3 3 Third A v e . New York, Ν . Υ. 1 0 0 1 7

Exhibiting: Photoelectric spectro photometer, T y p e QV-50 with flow dichroism measuring set and circular dichroism measuring set, a n d circular polarization checking set ; multipurpose recording spectrophotometer Type MPS-50 ; paper scanning a p p a r a t u s ; and recording differential thermal anal ysis a p p a r a t u s , T y p e D T - 1 0 B . SIEMENS AMERICA, I N C . M e a s u r i n g I n s t r u m e n t s Division Empire State Bldg. 3 5 0 Fifth A v e . New York 1 , Ν. Υ.

Exhibiting: A complete line of x-ray spectroscopy equipment including: xray spectrometers, x-ray detectors, x-ray counting a n d recording equip ment, a n d a high power x-ray gener ator. SPEX INDUSTRIES, I N C . 3 8 8 0 Park Ave. Metuchen, N. J. 08841

Exhibiting: Differential thermal anal ysis equipment including complete de tection a n d readout system and T G A utilizing a C a h n electrobalance ; m i x e r / mills and Shatterbox grinders and emis sion spectrochemical accessories. ROBERT L. STONE C O . 3 3 1 6 Westhill Drive Austin, Texas 78704

Exhibiting: Differential thermal anal ysis i n s t r u m e n t in operation; thermogravimetric analysis instrument in operation. TECHNICAL EQUIPMENT 9 1 7 Acoma St. Denver, Colo.

CORP.

Exhibiting: Differential thermal anal ysis system with digital readout and adiabatic calorimeter. TECHNICAL MEASUREMENT 441 Washington Ave. N o r t h H a v e n , Conn.

CORP.

Exhibiting: Activatron 211 neutron generator; Model 4 1 0 D pulse height analyzer: Model 305/306 Mossbauer system: Model 1000 CAT, computer of average transients; Model 707A liquid scintillation spectrometer: Model S80-D dual channel scanning chromatogram; and Model 1056-ΟΌ automatic ultra violet analyzer. TECHNICAL A N D SCIENTIFIC B O O K CENTER 1 2 0 6 Penn A v e . P i t t s b u r g h 2 1 , Ρα.

Exhibiting: Recently published books covering t h e fields of infrared spectros copy, emission spectroscopy, x-ray spectroscopy, trace analysis, gases in metals, ultraviolet spectroscopy, x-ray diffraction, crystallography, nucleonics, gas chromatography, fast reaction kinetics, electron spin resonance, elec t r o n microprobe analysis, atomic a b sorption spectrometry, magnetic opti cal rotatory dispersion, and new instru mentation techniques; Russian transla tions. T E C H N I C O N CONTROLS, I N C . S a w M i l l River R d . Chauncey, Ν . Υ.

PITTSBURGH EXPOSITION Exhibiting: Amino acid analyzer; N 0 N 0 2 air pollution system; glucose ana lyzer, Monitor II for residual chlorine, CHN-Alyzer.

Exhibiting: Ultrapurity spectroscopic carbon and graphite products, includ ing: preforms, rod, powder; crucibles and funnels for vacuum fusion analysis, graphite articles for special metallurgi cal and semiconductor applications.

Is there

Exhibiting: High pressure, high tem perature equipment; x-ray furnace; x-ray diffraction system.

ULTRA-VIOLET PRODUCTS, INC. 5 1 1 4 Walnut Grove Ave. San Gabriel, Calif. 9 1 7 7 8

SO

TEXAS INSTRUMENTS, INC. 3 6 0 9 Buffalo Speedway Houston, Texas 7 7 0 0 6

Exhibiting: Xew transillumination chromatogram viewer; new calibrated stable light source for UV and visible; new hand meter for long and shortwave UV; complete line of laboratory UV lamps and reference sources.

in your air?

TEM-PRES RESEARCH, INC. 1401 South Atherton Street State College, Pa. 16801

THERMOLYNE CORP. 2555 Kerper Blvd. Dubuque, Iowa 5 2 0 0 3

Exhibiting: Porcelain-steel top hot plates, high temperature electric muffle furnaces, stirring hot plate, Stir-Light, dry sterilizer, constant temperature Dri-Baths, electronic furnace controls, laboratory light and stand, aluminum top thermostatically controlled hot plates. THERMOMETER CORP. OF AMERICA 74 West Columbia St. Springfield, Ohio

Exhibiting: Illustrations of various steps in manufacture of thermometers will be presented along with display of laboratory thermometers and hydrom eters. ARTHUR H. THOMAS CO. Third and Vine Sts. Philadelphia, Pa. 19105

Exhibiting: Micro combustion appa ratus, Model 35, for the micro deter mination of carbon and hydrogen in or ganic substances; electrodes; thin layer chromatography apparatus; balances; Kjeldahl digestion rack; pH meters; Magne Vap Evaporator; spectropho tometers and spectrophotometric acces sories; etc. THE TORSION BALANCE C O . 35 Monhegan St. Clifton, N. J.

UNICAM INSTRUMENTS, LTD. York St. Cambridge, England

Exhibiting: SP 200G grating infrared spectrophotometer; SPSOOE automated ultraviolet and visible spectrophotom eter; SP90 atomic absorption spectro photometer.

UNION CARBIDE CORP. Carbon Products Division 2 7 0 Park Ave. New York 17, Ν. Υ.

Exhibiting: Spectroscopic products— carbon and graphite rods, powders and electrodes; vacuum fusion and inert gas fusion crucibles; boron nitride cruci bles; heat shields, rods, plates, and powder.

2

Measure and Record i t . . . Accurately and Continuously with the S / l Model 65-8

SO ANALYZER/RECORDER A direct, quantitative and specific method for measuring sulfur dioxide, by volume, in the air.

HIGH ACCURACY... Concentrations of SO2 as small as 1 pphm, by volume, can be measured and recorded.

WIDE OPERATING RANGE... Four pre-set ranges - (0—.04, 0—.1,0—.4,0—1 ppm) - with built-in inter-range calibrations.

AUTOMATIC CYCLING... U. S. STONEWARE CO. 6 0 East 42nd St. New York, Ν. Υ.

VARIAN ASSOCIATES 611 Hansen W a y Palo Alto, Calif.

Exhibiting: Single pan analytical elec tronic balance, top-loading electronic balance, other precision weighing equip ment; Anaerobic jar, glove cabinet, mortar grinder.

Exhibiting: NMR spectroscopy, EPR spectroscopy, mass spectroscopy, and associate accessories.

TRACERLAB Div. of Laboratory for Electronics, Inc. 1601 Trapelo Road W a l t h a m , Mass. 0 2 1 5 4

VICTOREEN INSTRUMENT C O . 5 8 0 6 Hough Ave. Cleveland 3, Ohio

ULTRA CARBON CORP. P. O. Box 7 4 7 Bay City, Mich. 4 8 7 0 4

Exhibiting: 4000 Series research gas chromatographs ; vibrating reed elec trometer (1 Χ 10' 1 3 amp.) for pesti cide, biochemical, and chemical analysis.

Automatic flushing and cycling capability from 2 to 30 minutes for full scale deflection.

PORTABLE... Weighs only 30 pounds net. Measures 30" χ 14" χ 14" and operates on 110 v. 60 c.

INEXPENSIVE... Cost is substantially less than any comparable unit. Only $1,475.00 FOB New York. Call or write for detailed literature.

S/

I

Scientific Industries, Inc.

15 Park Street,

Springfield, Massachusetts, 01103

(413) 732-6233 See Buyers' Guide for all products/sales offices. Circle No. 37 on Readers' Service Card VOL. 38, N O . 2 , FEBRUARY 1966 • 119 A

Arsenic Analysis to 0.1 ppm

PITTSBURGH EXPOSITION Featuring dual column design for all glass and/or metal columns, subambient temperature programming, dual chan nel chromatography, individually con trolled detector ovens for thermal con ductivity, electron capture and flame detectors. Log electrometer, vibrating reed electrometer measuring 10~8 to 10~15 amp.

VOLAND CORP. 2 7 Centre A v e . N e w Rochelle, Ν. Υ.

^κ Χ " '

ι

ι

Γ

-3 -.6 VOLTS -.9 Standard 1.2 ppm Sodium Arsenite solution in 0.1M Sulfuric Acid. A linear graph is obtained between 0.1 and 10 ppm, when peak height, at -0.6V, is plotted against concentration. 10802

Exhibiting: Analytical balances and precision weighing equipment.

* / N o w , y o u c a n d e t e c t Arsenic d o w n t o 0 . 1 p p m w i t h a single i n s t r u m e n t . . . in 1 0 m i n u t e s or less . . . by a s i m p l i f i e d m e t h o d t h a t e l i m i n a t e s c o m p l i c a t e d l a b o r a t o r y p r o c e d u r e s . T h e c h a r t above shows t w o t r a c e s m a d e on t h e s a m e s a m p l e w i t h a Melabs CPA-3 PULSE POLAROGRAPHIC ANA LYZER. T h e lighter t r a c e is a c o n v e n t i o n a l p o l a r o g r a m a n d t h e d a r k e r a

W A R N E R - C H I L C O T T LABORATORIES 2 0 1 Tabor Road Morris Plains, N . J.

W A R N E R A N D SWASEY Control Instrument Div. 3 2 - 1 6 D o w n i n g St. Flushing, Ν . Υ. 11354

COMPANY

Exhibiting: Model 501 rapid scanning spectrometer.

pulse p o l a r o g r a m i l l u s t r a t i n g t h e g r e a t l y i m p r o v e d s e n s i t i v i t y a n d resolu t i o n of t h e pulse t e c h n i q u e . MEASUREMENTS Choice of f o u r o p e r a t i n g m o d e s , each m a k i n g use of accurate threee l e c t r o d e , c o n t r o l l e d - p o t e n t i a l c i r c u i t r y : 1) Conventional polarography w i t h i m p r o v e d abil ity t o w o r k in high-resistance s o l u t i o n s . 2) Single-sweep for r e a d i n g t i m e s of less t h a n 10 s e c o n d s . 3 ) Integral-pulse f o r better p e r f o r m ance w i t h s o l i d electrodes. 4 ) Differential pulse f o r high s e n s i t i v i t y and r e s o l u t i o n . READOUT

Output for strip-chart recorder,

Χ Ύ recorder, or oscilloscope.

WATERS ASSOCIATES, I N C . 6 1 F o u n t a i n St. Framingham, Mass. 0 1 7 0 2

T Y P I C A L USES Air and water pollution s t u d i e s a n d pesticide a n d p h a r m a c e u t i c a l anal yses f o r C u , N i , Fe, Z n , Sb, Ag, Si, Sn, Cd, Pb, a n d V.

Exhibiting: Liquid-liquid chromatograph: R-4 liquid chromatography de tector; gel permeation chromatograph/automatic chemical analyzer; Ana Prep GPC: column packing for gas chromatography.

W E S T I N G H O U S E ELECTRIC No. 3 G a t e w a y Center Pittsburgh 3 0 , Pa.

CORP.

Exhibiting: Hollow cathode discharge for atomic absorption spectroscopy. Send f o r d e s c r i p t i v e l i t e r a t u r e , b i b l i o g r a p h y , a n d a list of t r a c e m e t a l s analyzed a n d s e n s i t i v i t i e s . J O H N WILEY & S O N S , I N C . 6 0 5 Third A v e . N e w York, N. Y. 10016

Exhibiting: Titles in analytical chem istry and spectroscopy—both texts and professional reference books. -Circle No. 26 on Readers' Service Card

SEE MELABS AT PITTSBURGH CONFERENCE INSTRUMENTS OF QUALITY

Melabs

3300 Hillview Ave., Stanford Industrial Park Palo Alto, California 94304 Phone: (415) 326-9500/TWX: 415-492-9488/Cable: MELABS PALOALTO See Buyers' Guide for all products/sales offices. Circle No. 113 on Readers' Service Card VOL.

3 8 , N O . 2 , FEBRUARY 1 9 6 6

•

121

A

1 CHOLESTAN-3-ONE

CHOLESTEROL


Exhibiting: Aerograph Duo-Dual channel gas ohromatograph, Aerograph large scale preparative gas ohromato graph, Aerograph improved moduline with extra large oven, Model 1520 and Model 204; Aerograph biomedical gas ohromatograph Model 2000: other newly developed gas chromatographs.

f

1

WILKENS INSTRUMENT & RESEARCH, INC. P . O . Box 313 Walnut Creek, Calif.

WILKS SCIENTIFIC CORP. 140 W a l k e r St. Norwalk, Conn. Figure 1 —Company A. Support acid and base washed, vacuum siliconized, 80/90 mesh.

1 *

10

New HighPerformance J-M Chromosorb Wand G (AW-DMCS)

q

ζ

ΐ -1

. · .^.

s

111 Ο X Ο

Figure 2—Johns-Manville. High-performance Chromosorb W, AW-DMCS, 80/100 mesh.

< (Λ Ο χ

ο

After only 60 minutes conditioning at 230"C, compare inertness of support at peak response

Figure 3 —Company B, Support acid washed, DMCS treated, 80/100 mesh. This is Company B's latest improved version for steroid, alkaloids, bile acids, pesticides, etc. CONDITIONS: All columns 4 ft. χ 3 mm

ID

glass " U " tube. All coated with 3% SE-30 and conditioned at 230°C for 60 minutes, flow 60 ml/min. Same operating condi tions. Sample: 1 microliter toluene con taining 1 microgram each of cholesterol and cholestan-3-one. COMMENTS: Figure 1—The highly sensitive cholesterol is dehydrated and seen as a tailing peak. The cholestan-3-one seen much later as a severely tailing peak. Fig ure 2—Chromosorb W gives two distinct peaks with no tailing, no loss. Figure 3— Part of the cholesterol is lost, as indicated by the smaller peak. High-performance J-M Chromosorb G, AW-DMCS gives results comparable to Chromosorb W. These high-performance grades have been developed to provide a support with the highest inertness. They

have the advantage of not requiring long periods of conditioning. These grades sup plement present acid washed, dimethyldichlorosilane (AW-DMCS) Chromosorb grades. AVAILABILITY: High-performanceJ-M Chrom osorb W and G, AW-DMCS grades are avail able in 80/100 and 100/120 mesh frac tions. Chromosorb W packaged in 100 gram glass bottles and Chromosorb G in 250 gram glass bottles. EVALUATION KIT: 60 ml samples of new highperformance J-M Chromosorb W and G (AW-DMCS) in both 80/100 and 100/120 mesh ranges are available. Send $2.00 to Johns-Manville, Box 1960, Trenton, New Jersey. JM

Johns-Manville

Circle No. 108 onReaders' Service Card 122 A

•


Exhibiting: Internal reflectance at tachments; internal reflectance spec trometer; product line of UV and vis ible internal reflection attachments; GC-IR analyzer accessory ; product line of GC-IR analyzer spectrophotometers.

WILL SCIENTIFIC, INC. Box 1050 Rochester, Ν. Υ. 14603

Exhibiting: R/A Aqua-Meter; the Biosonik II ultrasonic probe for speed ing chemical reactions, mixing and dis persing; new advances in gas chroma tography and in spectrophotometry; Corning widescale pH meters; Mettler and Torsion precision balances; new Gyratherm II magnetic stirrer-hot plate; Will ultrasonic cleaners and a complete line of spectrophotometry cells.

ZEEBAC 141 Fourth Ave. Berea, Ohio 4 4 0 1 7

Exhibiting: Emission spectrographic instruments and accessories ; B&L spec trographs, Zeebac excitation sources, constant current d.c. power sources, ex citation stand, Atmo-Jet atmosphere control device, plasma jet and manifold, balance, briquetting press, timers, car rier type chemicals, new Z-Calc, and technical books for spectroscopy.

CARL ZEISS, INC. 4 4 4 Fifth Ave. New York, Ν. Υ. 10018

Exhibiting: Atomic absorption system FA I I ; atomic sample changer; acces sories for Sîpectrophotometer PMQ II.

PITTSBURGH EXPOSITION OF MODERN LABORATORY

Recommend Documents