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 perform ers. With solid experience. And all the right equipment. Fisons Instruments has been formed by three ot 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 instrumen tation needs. So when you need special ized laboratory equipment such as spectrometers, chromatographs, rheometers, vis cometers, lab automation or temperature control instrumen tation, remember to select the right partner: Fisons Instruments. For afreebrochure, cot) or write: 24911 Avenue Stanford Valencia, CA 91355 Tel: 805/295-0019 800/551-8741 Interstate 800/631-6841 California
FISONS Γ
mm
:
~
Instruments
AppteuFieseatïri Laboresoraes
CARLO ERBR insTRumEnTs
HAAKE CIRCLE 58 ON . READER SERVICE CARD
T h e API MS/MS 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 MS 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 Gilbert, 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
