NEW/
PRODUCTS
Mercury analyzer measures mercury in concentrations as low as 0.02 ppb. The unit, an accessory for t h e c o m p a n y AA and uv s p e c t r o p h o t o m e t e r s , automates the conversion of mercury into the vapor state and delivery of the sample to analytical cells. $ 8 0 0 . Beckman I n s t r u m e n t s , Inc. 714-871-4848
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Pocket calculator HP-35 weighs only 9 oz and fits into a shirt pocket. Battery-operated unit performs all trigonometric and logarithmic f u n c t i o n s , square root, a r i t h m e t i c f u n c t i o n s , and several other m a t h o p e r a t i o n s , w i t h a single-key stroke. $395. Hewlett-Packard. 415-4931501 402
Console close-up of one of nine new m i n i c o m p u t e r s . Unit prices for the smallest models start at under $ 3 0 0 0 , and OEM quantities are available for under $ 2 0 0 0 / u n i t . The c o m p a n y also plans to make it easier t o buy the equipment and to provide better service. Available are extensive optional e q u i p m e n t and libraries of software. General A u t o m a t i o n , Inc. 7 1 4 - 7 7 8 - 4 8 0 0 403 ANALYTICAL CHEMISTRY, VOL. 4 4 , NO. 3, MARCH 1972
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New Products ± l - p p m / y e a r stability; the SM-105A uses a 1-MHz crystal accurate to ± 2 Hz with overall time-base accuracy of ± 1 0 ppm. $350 and $500. Heath/ Schlumberger. 616-983-3961 412 Pulse shape analyzer 458 operates over a 400 : 1 dynamic range with scintilla tors for neutron-gamma discrimination schemes. It can also be used with gaseous detectors for particle identifi cation, with large Ge(li) semiconductor detectors, and with proton-recoil pro portional counters. $1250. Ortec, Inc. 615-482-4411 413
Flame photometer system measures micro samples down to 0.0025 ml of undiluted serum (measures 0.002 meq/l. of Na or Li and 0.002 meq/l. of K) and displays dual readout of Κ and Na or Κ and Li directly in meq/l. or ppm. Advantages of this clinical system over others are its use of propane, natural, or illuminating gas with out any deterioration in results and its timing circuit which eliminates the need for holding the reference Li concentration within narrow limits. $3000. OCLI Instru ments. 203-853-2224 404
Time mark generator Model 226A sup plies narrow 1-V pulses at precise time intervals for calibrating the time bases of oscilloscopes and recorders. Inter val accuracy is ± 0 . 0 0 2 % after l/2 n r warm-up. A 1-V trigger output pulse is also available. A TTL-compatible pro gramming option makes all ranges pro grammable with a 6-bit binary instruc tion. $670; programming option, $150. Hewlett-Packard Co. 415-493-1501 405
Autotrac phase shifter Model 811 is versatile reference channel for a lock-in amplifier. Operation range is 1 Hz to 1 MHz; mode may be manual or auto; nearly any waveform will yield a clean square-wave output. $1100. Keithley Instruments, Inc. 216-248-0400 4 0 6
Controlled atmosphere sample holder to maintain dynamic atmosphere or enable true flow-through gas capability is avail able for company dta systems. Fisher Scientific Co. 412-391-1330 407
Centriflow conical membrane with re tention for molecules above about 20,000 molecular weight can be used for rapid ultrafiltrations of small sam ples in lab centrifuges. The CF20 was especially developed to retain Bence Jones proteins and other moieties of similar molecular weight. Amicon Corp. 617-861-9600 408 98 A .
Electronic calculator kits are the 816-A with 8-digit input and 16-digit output and the 816-B with both 16-digit input and output. Assembly time is esti mated at 10 hr for beginners. 816-A, $159.88 or $245 assembled; 816-B, $174 or $269 assembled. Micro In strumentation and Telemetry Systems. 505-266-2330 414
Optical passband filters, Type B-14, are first-order metal-dielectric, Fabry-Perot filters for use in filter radiometers, colorimeters, flame photometers, and similar analytical instruments. The filters block all secondary transmission bands from X-ray to ir. Prices for metal-dielectric filters run about 3 5 % less than the most nearly equivalent alldielectric filters. Baird-Atomic. 617276-6420 409 Adiabatic helical Teflon spinning-band distillation column is a self-contained unit enabling product separation by distillation under high vacuum. The column has been developed by Drs. Wingler and Fritz of Normag, Germany. Units are 50, 75, and 100 cm long. $750 to $875. Norell Chemical Co., Inc. 201-398-1324 410 SM-101A portable pH meter for educa tional or routine uses has only two con trols: off-on battery test switch and a set control to standardize the meter. Range is 0-12; accuracy is ± 0 . 1 when measured within 3 pH of buffer point. $79. Heath/Schlumberger. 616-9833961 411 SM-105A and SM-104A frequency counters provide 10 Hz to cover the 80-MHz range in compact, low-cost, solid-state units. For critical applica tions the SM-104A with built-in TCXO provides a MH3 ±0.1-Hz time base and
ANALYTICAL CHEMISTRY, VOL. 44, NO. 3, MARCH 1972
Fractovap new low-cost, dual-column gas chromatographs come in three dif ferent compact modular versions: 2201 with dual-flame ionization detector; 2205 with four hot-wire detectors; and 2207 with dual-flame and four hot-wire detectors. Flame-ionization detectors can be easily removed and replaced by electron capture, thermionic, microcross section detectors, etc. Carlo Erba, Box 4342, 20100 Milano, Italy. Tel: 6995 415 Potentiometric strip-chart recorders with three methods for synchronizing to instrumentation are available in multior single-range models with full-scale sensitivities from 1 to 1000 mV. Ac curacy is better than 0.25%; pen re sponse is 0.6 sec, full scale. Other features include 2 χ zero adjust, auto matic gain control on calibrated ranges, six switch-selected chart speeds and disposable market pens. $515 to $625. McKee-Pedersen Instruments. 415-9373630 416
New Products
THE COMPLETE POTENTIOSTAT! The new PAR™ Potentiostat/Galvanostat provides more features, modes of operation and flexibility than ever before available. φ
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Equilibrium dialysis system provides ac curate determination of binding param eters (association constants K, thermo dynamics including free-energy change AG", enthalpy change AH", entropy change AS", binding sites n) as well as interactions between low-molecular ligands and biopolymers. Applications abound in the biological and pharma ceutical sciences. $1390. Kontron, Inc. 609-921-2080 417
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• Remote electrometer probe (mounted in signal cable) • 1 0 η Ω input impedance • Slewing rate: 10V//iS
• ' 100 V compliance, 1 Λ max. • T w o independent, internal potential sources • High speed electronic potential switching
Plug-in modules provide m a x i m u m flexibility in readout. Positive feed back IR compensation, high current m e a s u r e m e n t and galvanostatic capabilities up to 1 A are available. The Model 173 replaces a potentiostat, two voltage sources and a current-measuring device. Price of the Model 173 is $2475 including p r o b e . Digital version, $2825. Current r e a d o u t module, $200. I-E converter, $675. 100 mA output ver sion less t h a n $2000. For more data, contact Princeton Applied Research Corp., Box 565, Princeton, N.J. 08540; t e l e p h o n e (609) 452-2111. \A\PRINCETON APPLIED RESEARCH CORPORATION
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Rapid-scan "spectro-colorimeter" pro vides instant transmission display of the visible spectrum on an oscilloscope or recorder. Large or small specimens can be accommodated, and the unit can be used to make single-wavelength measurements. Wavelength range is 400 to 700 nm with accuracy of 25 nm; scanning frequency is 20/sec. Op tional accessories are available. $1900. Broomer Research Corp. 516249-1544 418
Model 635D double-beam uv/vis spec trophotometer features digital readout. Supported by a two-year warranty, the instrument includes the following ad vanced features: large accessible sample compartment; extra-wide sepa ration of sample and reference beams, four scan speeds, energy warning light, damping selector, and cell ejectors; and all solid state circuitry with plug-in boards and integral power supply. $4750. Varian Techtron. 415-9392400 419
Modular pulse generator has a repeti tion rate of 1 Hz to 50 MHz and delays and widths adjustable to 1 sec. Model 8010 provides output for TTL and ECL simultaneously and an output for the AEC NIM standard. $345. Berkeley Nucleonics Corp. 415-527-1121 4 2 0
CIRCLE 149 ON READER SERVICE CARD
Variable / p e e d
Fiani cvaponaTOR with
THERMO-LIFT Controlled Heating Bath
This model is equipped with a series wound motor and solid state control providing adjustable speed between 25 and 150 RPM. The Flash Evaporator assures high evaporation rate—without contaminating back-drip—of aqueous solutions, high boiling point solvents and other materials. An ideal source of heat is Buchler's Thermo-Lift which is a combination lift and temperature controlled water bath. The Thermo-Lift, which may be adjusted from 8" to 16" in height, is useful as a source of heat for rotary evaporators, for distillation procedures and for applications where flexibility in height is required.
BUCHLER INSTRUMENTS DIVISION NUCLEAR-CHICAGO CORP. Λ SUBSIDIARY OF G 0 [ SEARLE ] & CO 1327 SIXTEENTH STREET, FORT LEE, NEW JERSEY, 07024 W r i t e f o r T e c h n i c a l Bulletin CIRCLE 2 6 O N READER SERVICE CARD
ANALYTICAL CHEMISTRY, VOL. 44, NO. 3, MARCH 1972
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New Products
ADD A MASS SPECTROMETER TO YOUR LAB.., EVEN ON A LIMITED BUDGET
At $6,925, the 60° sector, magnetically scanned EM-600 Mass Spectrometer is priced low enough to let you complete your analytical capability with a second (or third) instrumental technique — even on a limited budget. Use the EM-600 to confirm functional group assignments made with IR .. . to analyze collected fractions separated by GC . . . to fill in the complete structure by adding to 1H chemical environment information obtained by NMR (see spectrum below). In short, use it to make optimum use of several techniques.
M-45
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Interfaces for Biomation's transient recorders to most recording and processing devices include teletypewriters, paper-tape punch systems, digital printers, calculators and computers. Prices start at $430. Pivan Data Systems, Inc. 312-676-0790 421 Model 8100 transient recorder uses an ultra high-speed 8-bit A-D converter with maximum-word conversion rate of 100 MHz which is combined with an 8-bit, 2000-word memory to capture and hold the digital equivalent of an analog signal. Transients as short as 100 nsec with 10 points on a trace can be recorded with an input sensitivity of ± 5 . 0 mV to ± 5 V full scale. $9500. Biomation Corp. 415-321-9710 422 Dynatrac 391 lock-in amplifier uses the heterodyning principle and provides a tracking front-end filter that eliminates harmonics and overloading interference without manual filters. Frequency is from 0.1 Hz to 200 kHz in optimized ranges; sensitivity is 100 nV full scale (to 100 pV with external preamplifier). Cost is $1595 to $1695, depending on frequency plug-in; $1395 without plug-in. Ithaco, Inc. 607-272-7640 423
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This spcctrLm completed the identification of the sample as ethyl cyanoacetate. The odd mass molecular ion and the masses of the fragment peaks, when added to the NMR data, were sufficient for complete identification.
For mass spectroscopy to 350 amu, the EM-600 is truly outstanding. In teaching, it helps spread your lab dollars over more instruments for more students to use. In analysis, it lets you solve more problems for less money — whether used alone or in combination with other techniques. And in all cases it's simple to use and highly reliable. The EM-600 is one of a unified line of products from Varian Anaspect... specialist in quality instruments designed to give you more data per dollar. For more information, including a booklet illustrating uses of the instrument, write to Varian Anaspect, 611 Hansen Way, Palo Alto, California 94303.
varian anaspect SEE V A R I A N ANASPECT AT T H E BOSTON ACS MEETING CIRCLE 189 ON READER SERVICE CARD
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ANALYTICAL CHEMISTRY, VOL. 44, NO. 3, MARCH 1972
Polarimeter for quick checking of optical polarizations of liquids uses polarizing filters rather than crystals. Design is ideal for educational uses and routine applications. $49.75. Instruments for Research and Industry. 215-745-4440 424
New Products
Inert gas purifier GP-1 removes carbon, nitrogen, oxygen, and water from inert gases such as argon, helium, krypton, neon, or xenon. Impurity output level is maintained at about 0.001 ppm. $485. Frank D. Livelli & Co. 201-9332575 425 Automatic sampler-diluter covers the sample size range from 2 to 200 μ). Diluent volume can also be adjusted from 10 μ\ to 10 cc (a 1000-to-l range). Reproducibility is better than 0.4% at one std dev at y2 ° f t n e maximum vol ume range. $795. Rohe' Scientific. 714-547-3916 426
ISO PROBE
Measures
ELECTROSTATIC POTENTIAL r Without Physical Contact = Ξ The Easy Way Ξ — For R e s e a r c h o r P r o d u c t i o n L i n e —
APPLICATIONS Accurate surface potential measurement of small area Measurement of Electrets Illumination effects on charged surface Surface charge leakage measurement Electrostatic field measurement Electrostatic monitoring systems for: Hazardous industrial areas Hospitals Film Processors Flammable fuel storage and transfer areas Aircraft Plastic Manufacturing Textile Manufacturing
FEATURES — — — — — — — — — — — = — — —
· Simple Operation - No Time Consuming Set-ups or Special Shielding Required · Drift Free Performance · Absolute Calibration · Accuracy Essentially Independent of Probe-to-Surface Spacing · Inherent error less than 0 . 1 % · Millivolt to kilovolt ranges · Surface resolution better than 0.03" circle · New TRANSPARENT PROBE Uses no mirrors or Coated Glass - Permits Direct Illumination of Charged Areas
Ξ ALSO AVAILABLE: ~ Portable Instruments ~ D.C. Fieldmeters ~ Special Purpose Electrometers ^
W r i t e today for catalog
!i> MONROE ELECTRONICS, INC 100 HOUSEL AVENUE LYNDONVILLE, NEW YORK 14098
Micro pipetters w i t h disposable Teflon t i p s c o m e in f o u r m o d e l s w i t h v o l u m e i n f i n i t e l y a d j u s t a b l e f r o m a l m o s t zero t o 5, 12.5, 2 5 , and 5 0 μ\. The 5-μ\ m o d e l can deliver 1 μ\ t o ± 0 . 0 1 μ\ (1%). $ 4 8 t o $ 6 0 ; disposable Teflon t i p s , $ 4 . 5 0 t o $ 6 . 5 0 (pkg of 1 0 0 ) . Unim e t r i c s Universal Corp. 7 1 4 - 8 7 9 - 3 7 7 7 427 pH controller can sense and control pH over t h e 1—14 range; desired l i m i t s are p r o g r a m m e d w i t h t w o f r o n t - p a n e l dials. $199. A n expanded scale p H m e t e r Type 4 0 E is a battery-operated portable m o d e l w i t h a 6-in. meter. The 1 - 1 4 pH range can be expanded t o a range of 1.4 p H . Accuracy is 0.05 and readabil ity is better t h a n 0.003 pH u n i t . $ 9 9 . C h e m t r i x , Inc. 5 0 3 - 6 4 8 - 1 4 3 4 428 Angular baseline corrector as an option for t h e c o m p a n y ' s 200-series integrat ors f o r gc is available; o p e r a t i o n of t h e s t a n d a r d baseline corrector b u i l t into integrators is suspended d u r i n g the in t e g r a t i o n of peaks. $ 3 0 0 . Also avail able as a plug-in o p t i o n f o r these inte grators is a teletype d e c o d e r / c o n t r o l l e r s y s t e m . This s y s t e m , useful for routine analytical w o r k , p r o m i s e s a level of automatic integration comparable to high-powered c o m p u t e r s y s t e m s . Infotronics Corp. 512-454-3521 429
ALP-2 semiautomated system f o r all liquid-liquid extractions is particularly suitable f o r use in drug-screening pro grams. The system provides suitable extracts in mass scale procedures f o r t h e d e t e c t i o n of d r u g s of abuse, ste roids, f a t soluble v i t a m i n s , pesticides, a n d organic p o l l u t a n t s . A s a m p l e ex t r a c t i o n s t a t i o n and m u l t i p l e r o t a r y evaporator c o m p r i s e t h e system w h i c h has been engineered f o r o p t i m u m batch size so t h a t 50—70 dried extracts per hour can be provided f o r all c o m m o n lab procedures using tic, glc, f l u o r o m etry, etc. $ 7 3 7 7 . Cybertek, Inc. 5 1 6 822-4990 430
CIRCLE 129 ON READER SERVICE CARD 102 A
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ANALYTICAL CHEMISTRY, VOL. 4 4 , NO. 3, MARCH 1 9 7 2
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BIORAD stocks DOWEX® ion exchange resins, anion and cation, in 44 types and bead sizes.
For immediate shipment! Need we say more? Only that BlO-RAD's AG« resins—the research standard of excellence— are also available for those applications requiring the highest chemical purity. For details on DOWEX and AG, send for our new complete catalog and price libt.
BIO-RAD Laboratories 32nd & Griffin Ave. Richmond, Cal. 94804 (415) 2 3 4 - 4 1 3 0 220 Maple Ave. Rockville Centre. NY 11570
(516)764-2575 Γ Ι Ρ Π Ρ OR O M PFAHFP ^FDVITF ΓΛΡΠ
