AC
BRIEFS
A New Type of Interference in Atomic Absorption or Emission Measurements with the Premixed Nitrous Oxide-Acetylene Flame Interference caused by the presence of mineral acids in sample solutions is discussed. Data are given for the change in emission signals for a number of elements as a function of the perchloric acid concentration. S. R. KOIRTYOHANN and Ε. Ε. PICKETT, University of Missouri, Columbia, Mo. 65201 Anal. Chem. 40, 2068 (1968)
Correspondence Anion-Responsive Electrodes Based on Ion Association Extraction Systems C. J. COETZEE and HENRY FREISER, Department of Chemistry, The University of Arizona, Tucson, Ariz. 85721 Anal. Chem. 40, 2071 (1968)
Aids for Analytical Chemists An Improved Spectrophotometer Flow Cell Holder PAUL E. STRANDJORD and KATHLEEN J. CLAYSON, Depart ment of Laboratory Medicine, College of Medical Sciences, Uni versity of Minnesota, Minneapolis, Minn. 55455
You can get the whole Liquid Chromatography job done with the Nester/Faust Model 1200. Period. • A complete modular system for all modes of liquid chromatography. • Exact reproduc ible flow rates by digital, constant delivery pumps. • Base console is supplied with zero dead volume loop injector and one digital pump, and is prewired for all optional acces sories: X-Y fraction collector, automatic pro grammed solvent transport, choice of several detectors, high pressure digital pumps, low and high pressure injectors, variety of analyti cal and preparative columns, presaturator columns and liquid debubblers. • Learn the one answer for liquid chromatography, send for technical literature No. 13-68. Nester/Faust Mfg. Corp., 2401 Ogletown Rd.. Newark, Del. 19711, (302) 737-6330.
Anal. Chem. 40, 2072 (1968)
Microdetermination of Pentafluorobenzyl Ester Derivatives of Organic Acids by Means of Electron Capture Gas Chromatography FRED K. K A W A H A R A , U. S. Department of the Interior, Federal Water Pollution Control Administration, Division of Pollution Surveillance, Cincinnati, Ohio Anal. Chem. 40, 2073 ( 1968)
A Radioisotope Source-Target Assembly for X-Ray Spectrometry ROBERT D. GIAUQUE, Lawrence Radiation Laboratory, Univer sity of California, Berkeley, Calif. Anal. Chem. 40, 2075 (1968)
A Micro-Preparative Gas Chromatograph and a Modified Carbon Skeleton Determinator ROBERT G. BROWNLEE and ROBERT M. SILVERSTEIN, Stanford Research Institute, Menlo Park, Calif. 94025 Anal. Chem. 40, 2077 (1968)
Calibration Technique for Counting Krypton-85 in Charcoal Traps D. A . SEIFERT and R. L. STUART, Nuclear Systems Programs, General Electric Co., Cincinnati, Ohio 45215 Anal. Chem. 40, 2080 (1968) Circle No. 185 on Readers' Service Card VOL. 40, NO. 13, NOVEMBER 1968
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