trace level
Briefs
S,N,X
Correspondence Comments on the Polarographic Determination of Metal-Bilirubin Formation Constants Michael D. Ryan, Todd Wehr Chemistry Building, Marquette University, Milwaukee, Wis. 53233 Anal. Chem., 47, 1717 (1975)
Comments on the Search for Amino Acids in Apollo 15,16, and 17 Lunar Samples. A Study in Contamination Control Paul B. Hamilton, Alfred I. duPont Institute, Box 269, Wilmington, Del. 19899, and Bartholomew Nagy, Laboratory of Organic Geochemistry, Department of Geosciences, The University of Arizona, Tucson, Ariz. 87521 Anal. Chem., 47,1718 (1975)
by the numbers. T H E DOHRMANN'' DIGITAL MICROCOULOMETER will improve your low level sulfur, nitrogen or halogen analyses because: DIGITAL READOUT in concentration units speeds data intepretation. PUSHBUTTON CONTROL simplifies operation.
Aids for Analytical Chemists
AUTOMATIC BASE LINE correction and bi-directional integration assure accurate data.
Simple Interface for Automated Mass Fragmentography with a Standard Laboratory Data System John M. Strong and Arthur J. Atkinson, Jr., Clinical Pharmacology Unit, Departments of Phamacology and Medicine, Northwestern University Medical School, Chicago, 111. 60611, and Robert J. Ferguson, Hewlett-Packard, Skokie, 111. 60076 Anal. Chem., 47,1720 (1975)
A recorder/integrator combination is no longer needed, so the Model C-300 offers an overall 30% savings in operator time and a 50% savings in systems size.
Potassium Bromide Disk Technique for Visible Spectra
Based on techniques Dohrmann pioneered in the early 1960's,the C-300 microcoulometer features ppm sensitivity with a precision of ±0.05 ppm.
L. F. Power, James Cook University of North Queensland, Post Office, James Cook University, Qld. 4811, Australia, and A. M. Tait, U.S. Army Natick Laboratories, Physical Research Group, Natick, Mass. 01760 Anal. Chem., 47, 1721 (1975)
Simple, Inexpensive Monochromator Modification Permitting Dual-Channel Operation D. W. Brinkman and R. D. Sacks, Department of Chemistry, University of Michigan, Ann Arbor, Mich. 48104 Anal. Chem., 47, 1723 (1975)
Guide for Scoring, Stripping and Spotting Thin Layer Plates Oscar Sudilovsky and Albert Kovach, Institute of Pathology, Case Western Reserve University, and University Hospitals of Cleveland, Cleveland, Ohio 44106 Anal. Chem., 47, 1725 (1975)
The Dohrmann system is recognized throughout the petroleum and chemical industries as the preferred means of performing accurate trace analyses of S, N and halogen in gases, liquids and solids. Major applications are verifying specifications of incoming or pretreated materials, determining product quality and monitoring plant effluents. DOHRMANN Division, Envirotech Corporation, 3240 Scott Boulevard, Santa Clara, CA 95050 (408) 249-6000 Telex 346 395
ENVIROTECH
Preparation of Standard Targets for X-Ray Analysis Rudy Baum and W. F. Gutknecht, Department of Chemistry, Duke University, Durham, N.C. 27706, and Robert D. Willis and Richard L. Walter, Department of Physics, Duke University, and Triangle Universities Nuclear Laboratory, Durham, N.C. 27706 Anal. Chem., 47, 1727 (1975)
CIRCLE 56 ON READER SERVICE CARD ANALYTICAL CHEMISTRY, VOL. 47, NO. 9, AUGUST 1975 · 817 A
