automate your high-volume pipetting procedures.
The A u t o m a t e d Pipetting Station f r o m M i c r o m e d i c Systems is t h e first instru ment that dilutes or dispenses s u b m i c r o volumes repetitively, automatically, with finer a c c u r a c y a n d t e c h n i q u e t h a n m a n ual pipetting. A n d processes 450 s t a n d ard test tubes per hour. Check these features: Continuously variable m i c r o m e t e r v o l u m e adjustment. Range of 2 t o 1000 μ\ of sample, 2 t o 5000 μ| of diluent o r reagent. M o v i n g t u b e racks. Liquid delivery against tube wall, and automatic t i p w i p i n g between passes.
Shock-free l i q u i d movement t h r o u g h Tef lon lines. Push-button c o n t r o l s . Plus the built-in a c c u r a c y and repeatability of our A u t o m a t i c Pipette. S e n d f o r literature, or call (215) 592-2401 for a d e m o n s t r a t i o n .
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mICROmEDIC
SYSTEmS, InC ROHM AND HAAS BUILDING INDEPENDENCE MALL WEST PHILADELPHIA, PENNA 19105
CIRCLE 84 ON READER SERVICE CARD
HIGH RESOLUTION MASS SPECTRA FOR DOLLARS INSTEAD OF THOUSANDS Are you typical of the chemist who needs high resolution mass spectral data, but cannot justify the expenditure of thousands of dollars for the equipment?
"""y*"" £3
A high and low resolution gas chromatographic
MS-30 mass spectrometer with a combined inlet is available to serve your needs.
Solids, liquids, or gases—low molecular weight or high (up to 2400)— are easily and quickly analyzed. The gas chromatographic inlet facilitates the identification of minor impurities in foods, drugs, solvents, or other chemicals. Pesticides, drugs, or other foreign chemicals are easily and unambiguously identified in water, body fluids, soil, or agricultural products. Elemental compositions are determined from mass measurements with accuracies better than ten parts per million. You can now obtain mass spectral data from the most sophisticated instrumentation available—and a t reasonable prices. Results are totally computerized, leading to speed, accuracy, and con venience of the final output. Contact: Stephen R. Shrader, Ph. D.
SHRADER ANALYTICAL & Consulting Laboratory, Inc.
B o o t h 123 a t t h e 23rd P i t t s b u r g h C o n f e r e n c e o n Analytical C h e m i s t r y
3450 Lovett A v e . D e t r o i t , M i c h . 48210 (313) 825-5550
84 A
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CIRCLE 105 ON READER SERVICE CARD ANALYTICAL CHEMISTRY, VOL. 4 3 , NO. 1 4 , DECEMBER 1 9 7 1
New Products
Model GM 100/35 auto-scanning (100 n m / m i n std) miniature monochromator for the 200- to 700-nm range of the spectrum has a high-performance grat ing unit with in-lin entrance/exit optics and a unique off-axis Ebert optical sys tem. Three sets of slits are provided: 0.5, 1.0, and 1.4 mm. Effective aper ture is f/4.7. Wavelength drive is manual or motor-driven. The instru ment weighs less than 2 lb. $680. Schoeffel Instrument Corp. 201-6647263 421 Multichannel peristaltic pump offers foam-free pumping action and an elec tronic control that permits continuously varying flow rates from 0.3 to 7200 ml/hr. The pump is self-priming and has no valves or seals. The 18-channel pump sells for $495; preassembled 6, 12, and 18-channel tubing sets are available. Brinkmann Instruments, Inc. 516-334-7500 422 CI-220 liquid particle analyzer auto matically determines the size distribu tion and mean diameter of particles suspended in liquids. The instrument's patented elliptical mirror design and light collection system provides unequaled detection and narrow size dis tributions. This light scattering instru ment offers great versatility and has potential applications in chemical and biological reaction and solution-rate studies and quality control. $7000 to $9000. Climet Instruments. 408-7366950 423 Model RC-3 microphotometer compara tor features electronic digital lock read out and is computer adaptable with an optional ASR 33 teletypewriter. A strip chart recorder output is also available. Prior features of the former RC-2 have been retained. Spectra are viewed on a 14 χ 14-in. glare-free screen featur ing 2 0 χ magnification. Emulsion den sity can be accurately detected over a range from 0 to densities greater than 2. About $7500. Baird-Atomic, Inc. 617-276-6094 424
