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Membrane Mass Spectrometry for the Direct Trace Analysis of Volatile Organic Compounds in Air and Water 1265 Membrane sampling of organic compounds in water and air is most efficient with thin membranes, at low temperatures, and with mixing at the sample/membrane interface. Sam pling efficiency is also dependent on membrane inlet config uration. Mark A. LaPack*, James C. Tou, and Christie G. Enke, Analyti cal Sciences Laboratory, The Dow Chemical Company, Midland, MI 48667, and Department of Chemistry, Michigan State Universi ty, East Lansing, MI 48824 Mass Spectrometry of Technetium at the Subprogram Level 1271 Blue M has a bath to meet your needs. Water, Oil, Refrigerated models including Shaker, Hydrometer and Full Visibility Jar designs from 0 C to + 260 C. Most feature the patented Magni-Whirl® agitation that made conventional circulating systems obso lete. Quality-built and available for immediate delivery. Contact your local laboratory distributor or Lindberg/ Blue M, 304 Hart Street, Watertown, WI 53094. Phone 414-261-7000 · FAX 414-261-0925. 1089 A
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Time-of-flight secondary ion mass spectra are obtained from thin films of perfluorinated poly- and copolyethers up to m/z 6500. Fragmentation patterns are unique and reproducible for each kind of poly- and copolyether, independent of sam ple preparation and substrate. loannis V. Bletsos and David M. Hercules*, Department of Chemistry, University of Pittsburgh, Pittsburgh, PA 15260, David Fowler, IBM Research Division, San Jose, CA 95120, and Dieter vanLeyen and Alfred Benninghoven, Physikalisches Institut, Universitât Munster, D-4400 Munster, Federal Republic of Germany Electrospray Ionization Combined with Ion Trap Mass Spectrometry
1284
Surface-Induced Dissociation by Fourier Transform Mass Spectrometry 1295 A detailed procedure for performing surface-induced dissociation of both electron ionization and laser-desorbed ions in a dual-cell Fourier transform mass spectrometer is described. Carl F. Ijames and Charles L. Wilkins*, Department of Chemistry, University of California, Riverside, CA 92521
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Time-of-Flight Secondary Ion Mass Spectrometry of Perfluorinated Polyethers
Ions formed via electrospray are injected into and analyzed with a quadrupole ion trap mass spectrometer. Data are shown for multiply charged anions and cations. Gary J. Van Berkel, Gary L. Glish, and Scott A. McLuckey*, Analytical Chemistry Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6365
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A method for the determination of >10 6 atoms of 98 Tc or 97 Tc and 5 Χ 106 atoms of " T c by negative thermal ioniza tion MS is described. Donald J. Bokop*, Norman C. Schroeder, and Kurt Wolfsberg, Isotope and Nuclear Chemistry Division, Los Alamos National Lab oratory, Los Alamos, NM 87545
Capillary Supercritical Fluid Chromatography at Pressures above 400 atm 1299 v^rvl
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692 A • ANALYTICAL CHEMISTRY, VOL. 62, NO. 13, JULY 1, 1990
Systems limited to ~400 atm are not able to access densities needed for many applications, especially when temperatures are raised to adjust selectivity. A modest improvement to 560 atm is beneficial, but much higher pressures are still needed. T. L. Chester*, D. J. Bowling, D. P. Innis, and J. D. Pinkston, The Procter & Gamble Company, Miami Valley Laboratories, P.O. Box 398707, Cincinnati, OH 45239-8707
