Briefs Diagnostic and Analytical Studies of the Inductively Coupled Plasma by Atomic Fluorescence Spectrometry 1521 Self-absorption and self-reversal in the ICP are investigated with the plasma used as an excitation source. Calculated detection limits for Zn, Mg, and Ca are respectively 13, 4, and 23 ng/mL. N. Omenetto, S. Nikdel, J. D. Bradshaw, M. S. Epstein, R. D. Reeves, and J. D. Winefordner,* Department of Chemistry, University of Florida, Gainesville, Fla. 32611 Anal. Chem., 51 (1979) Characterization of Pyrolysis Conditions and Intereference by Other Compounds in the Chemiluminescence Detection of Nitrosamines 1526 Response of a chemiluminescence detector as a function of pyrolysis chamber temperature is characterized for several nitrosamines and interfering compounds. Thomson J. Hansen, Michael C. Archer,* and Steven R. Tannenbaum, Department of Nutrition and Food Science, Massachusetts Institute of-Technology, Cambridge, Mass. 02139 Anal. Chem., 51 (1979) Isolation and Identification of Light Oil Alkanes in Shale Oil by Vapor Phase Reaction/Gas Chromatography 1529 On-line sulfuric acid and molecular sieve reactors resolve linear branched chain and cyclic alkanes from complex mixtures. F. P. DiSanzo, P. C. Uden,* and S. Siggia, Department of Chemistry, GRC Tower I, University of Massachusetts, Amherst, Mass. 01003 Anal. Chem., 51 (1979)
Measure solid concentrations, density, or specific gravity of your process liquids and gases with the Paar D M A 5 5 density meter to assure consistent p r o d u c t quality. Small 0.7 ml s a m p l e s f r o m the process are injected, p u m p e d , vacuum-suctioned or continuously flowed into the sample tube. In less than a s e c o n d , the instrument calculates and displays a 5-place digital result on the readout. This can be automatically transferred t o other instruments. T h e method is fast, simple and accurate. No need for separate temperature, weight or volume measurements. No pycnometer filling. Circle the number for full details. Mettler Instrument C o r poration, Box 71, Hightstown, NJ 08520.
Determination of Trace Level Ions by Ion Chromatography with Concentrator Columns 1532 After concentration, chloride, phosphate, nitrate, and sulfate are analyzed from ppm to low ppb levels. R. A. Wetzel,* C. L. Anderson, Helmut Schleicher, and G. D. Crook, Dionex Corporation, Ion Chromatography Systems, 1228 Tatan Way, Sunnyvale, Calif. 94086 Anal. Chem., 51 (1979) Gas Chromatography/lnfrared Matrix Isolation Spectrometry 1535 Components separated by a gas chromatograph are collected at low temperature in matrices of argon. Infrared spectra of the matrices show narrow well-resolved vibrational lines. Gerald T. Reedy,* Sidney Bourne, and Paul T. Cunningham, U.S. Department of Energy, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, 111. 60439 Anal. Chem., 51 (1979) Differential Programmed Temperature Gas Chromatography 1540 The technique provides dramatic increases in distance between solute maxima within a GC column, according to computer-simulated runs. Robert Rowan, Jr., Department of Chemistry, New Mexico State University, Las Cruces, N.M. 88003 Anal. Chem., 51 (1979)
mettler Electronic balances and weighing systems Thermal analysis instruments Titration instruments Automated laboratory systems
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