BRIEFS High-Perforniance Liquid Chromatography-Fluorometric Determination of Selenium Based on Selenotrisulfide Formation Reaction 233
To get to the top in laboratory instrumentation, you need the right j equipment. J
T h e method involves precolumn reaction of selenium(IV) with D-penicillamine and subsequent conversion to a fluorophore by reaction with 7-fluoro-4-nitrobenz-2,l,3-oxadiazole. Terumichi Nakagawa*, Eiji Aoyama, Noriko Hasegawa, Nobuhiro Kobayashi, and Hisashi Tanaka, Faculty of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto-shi, 606 Japan Thermal Gradient Liquid Chromatography: Application to Selective Element Detection by Inductively Coupled PlasmaAtomic Emission Spectrometry 236 A partial solution to the general elution problem of H P L C separations using ICP-AES detection is described. Examples of both aqueous and nonaqueous reversed-phase separations are presented. Wilton R. Biggs* and John Fetzer, Chevron Research Company, Richmond, CA 94802-0627 Effect of Temperature Gradients on the Efficiency of Capillary Zone Electrophoresis Separations 241 Using a parabolic model, an equation is derived for capillary zone electrophoresis t h a t relates t h e plate height t o t h e experimental parameters, taking into account thermal effects. Eli Grushka*, R. M. McCormick, and J. J. Kirkland, E. I. du Pont de Nemours & Company, Central Research and Development Department, Experimental Station, B-228, Wilmington, DE 19898 Photopolymerization of Plasticizer in Ion-Sensitive Membranes on Solid-State Sensors 246 Poly (vinyl chloride)-based K + sensitive membranes plasticized with dihexenyl adipate can be photopolymerized to increase the lifetime of membrane-coated solid-state sensors three- to fivefold under certain conditions. D. Jed Harrison*, Alem Teclemariam, and Linda L. Cunningham, Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada T6G 2G2
Band Broadening in Electrokinetic Chromatography with Micellar Solutions and Open-Tubular Capillaries
251
Both on-column injection and detection are used. Longitudinal molecular diffusion and sorption-desorption kinetics are found to be the major influences. Shigeru Terabe*, Koji Otsuka, and Teiichi Ando, Department of Industrial Chemistry, Faculty of Engineering, Kyoto University, Sakyo-ku, Kyoto 606, Japan
CIRCLE 58 ON READER SERVICE 1CARD
BRIEFS Atmospheric Pressure Ionization Tandem Mass Spectrometric System for Real-Time Detection of Low-Level Pollutants in Air 260
And the right company. In climbing—as in business— success ultimately depends on choosing the right partners. You need proven performers. With solid experience. And all the right equipment. Fisons Instruments has been formed by three of the most respected names in lab instrumentation: Applied Research Laboratories, Carlo Erba Instruments, Haake. Together, we are building an expanded distribution, service and technical support network throughout North and South America to be closer and more responsive to your instrumentation needs. So when you need specialized laboratory equipment such as spectrometers, chromatographs, rheometers, viscometers, lab automation or temperature control instrumentation, remember to select the right partner: Fisons Instruments. For a free brochure, cat) or write: 2491T Avenue Stanford Valencia, CA 91355 Tel: 805/295-0019 800/551-8741 interstate 800/631-6841 California
FISONS Instruments
/1RL Appiea Research !_j£Ks3!or©s
CARLO ERBA insTRumEHTS
HAAKE CIRCLE 58 ON READER SERVICE CARD
T h e API M S / M S system can detect less t h a n 10 p p t r of contaminants in air. A point to plane corona discharge is used to produce the primary ions t h a t ionize the trace molecules through a series of ion-molecule reactions. S. N. Ketkar*. J. G. Dulak, W. L. Fite, J. D. Buchner, and Seksan Dheandhanoo, Extrel Corporation, 240 Alpha Drive, Pittsburgh, PA 15238
D-Alanine as a Chemical Marker for the Determination of Streptococcal Cell Wall Levels in Mammalian Tissues by Gas Chromatography/Negative Ion Chemical Ionization Mass Spectrometry 265 Capillary GC separation on a chiral stationary phase using selected ion monitoring with negative ion detection and methane chemical ionization M S is used to quantitate a marker for bacterial peptidoglycan, D-alanine, in mammalian tissues. Kimio Ueda and Stephen L. Morgan, Department of Chemistry, University of South Carolina, Columbia, SC 29208, Alvin Fox* and James Gilbart, Department of Microbiology and Immunology, School of Medicine, University of South Carolina, Columbia, SC 29208, Anders Sonesson, Department of Technical Analytical Chemistry, Chemical Center, Lund University, P.O. Box 124, S-221 00 Lund, Sweden, Lennart Larsson, Department of Medical Microbiology, Lund University, Solvegatan 23, S-223 62 Lund, Sweden, and Goran Odham, Laboratory of Ecological Chemistry, Lund University, Ecological Building, Helgonavagen 5, S-223 62 Lund, Sweden
Correspondence Microelectrodes Coated with lonically Conducting Polymer Membranes for Voltammetric Detection in Flowing Supercritical Carbon Dioxide 270 Adrian C. Michael and R. Mark Wightman*, Department of Chemistry, Indiana University, Bloomington, IN 47405
Enhanced Detection of Sulfite by Inductively Coupled Plasma Atomic Emission Spectroscopy with High-Performance Liquid Chromatography 272 Dennis R. Migneault, The Connecticut Agricultural Experiment Station, New Haven, CT 06504
