Briefs
The Siemens Programmable Fraction Collector
Differential Determination of Chromium(VI)Chromium(lll) with Poly(dithiocarbamate) Chelating Resin and Inductively Coupled Plasma-Atomic Emission Spectrometry 364 Akira Miyazaki and Ramon M. Barnes*, Department of Chemistry, GRC Towers, University of Massachusetts, Amherst, Mass. 01003 Anal. Chem., 53 (1981)
Noise and Digital Resolution in a MicroprocessorControlled Spectrophotometer 366
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Wilbur Kaye* and Duane Barber, Beckman Instruments, Inc., Irvine, Calif. 92713 Anal. Chem., 53 (1981)
Low Absorbance Spectrophotometry
369
Wilbur Kaye, Beckman Instruments, Inc., Irvine, Calif. 92713 Anal. Chem., 53 (1981)
Gel Chromatography for the Isolation of Phenolic Acids from Tobacco Leaf
Makes your Analytical L.C. a part-time Prep System. Now you can collect prep scale fractions easily using existing L.C. Systems and Automatic Repeti tive Injection' that's part of the microprocessor controlled, Programmable Fraction Collector. Automatic peak and fraction collection functions can be quickly programmed via the keyboard and visual display to give maximum flexibility, reliabil ity, and unattended operation. Using Peak Control, three processor assisted levels of Time Control, a unique Peak/Time Control, and Variable Time De lay Controls, it is possible to collect all or any part of many peaks in either micro or macro scale. Peak identification by peak characteristics and ex pandability to include peak search functions are additional features. We've thought of lots of ways to use this flexible laboratory instrument—you'll think of more. Call 609-983-3616 or send for complete specifica tions. You'll be glad you did. 1
Kohler, D.A.; Telechak, M.J., "Preparative Liquid Chro matography by Automatic Repetitive Injection", Ameri can Laboratory Jan. 1979
* ES Industries is the exclusive distributor for the Sie mens Fraction Collector.
ES
INDUSTRIES
8 Ξ. Maple Ave. · Marlton, Ν J 0 8 0 5 3
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M. E. Snook*, P. J. Fortson, and Ο. Τ. Chortyk, Tobacco Safety Research Unit, Science and Education Administration/ Agricultural Research, United States Department of Agriculture, P.O. Box 5677, Athens, Ga. 30613 Anal. Chem., 53 (1981)
Differential Pulse Anodic Stripping Voltammetry Control Device With Digital Voltmeter
377
E. B. Buchanan, Jr.,* and D. D. Soleta, Chemistry Department, University of Iowa, Iowa City, Iowa 52242 Anal. Chem., 53 (1981)
Determination of Nitrite in Cured Meats by Chemiluminescence Detection
381
Robert C. Doerr*, Jay B. Fox, Jr., Leon Lakritz, and Walter Fiddler, Eastern Regional Research Center, Agricultural Research, Science and Education Administration, U.S. Department of Agriculture, Philadelphia, Pa. 19118 Anal. Chem., 53 (1981)
Correction. Chromite Method for Determination of Inorganic Peroxides in Alkaline Solution 384 Richard W. Lynch and Maurice R. Smith*, Olin Corporation, P. O. Box 248, Charleston, Tenn. 37310
Correction. Graphical Techniques for Kinetic Data Analyses of Alkaline Phosphatase 384 Jack W. Frazer* and Hal R. Brand, Lawrence Livermore Laboratory, University of California, Livermore, Calif. 94550
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I INDUSTRIES! CIRCLE 77 ON READER SERVICE CARD 114 A · ANALYTICAL CHEMISTRY, VOL. 53, NO. 2, FEBRUARY 1981
