BRIEFS
RENT
Coprecipitation of Trace Metals by DNA and RNA Molecules 504
/ GC»MSD»FTIR.AA.ICP«LCIR
DNA and RNA are used as carriers of trace metals in water for coprecipitation preconcentration. The method allows for the preconcentration of trace metal ions except iron, calcium, and magnesium, which are intrinsically contained in DNA and RNA. Kitao Fujiwara*, Ri-e Kojyo, and Kazuma Okada, Faculty of Integrated Arts and Sciences, Hiroshima University, 1-1-89 Higashisenda-machi, Hiroshima 730, Japan and Yukio Kodama, Ocean Research Institute, The University of Tokyo, 1-15-1 Minamidai, Nakano-ku, Tokyo 164, Japan
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Asphaltenes in Crude Oil: Absorbers and/or Scatterers in the Near-Infrared Region? 508
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New from Elsevier and the American Society for Mass Spectrometry!
Field-Corrected Ion Cell for Ion Cyclotron Resonance
520
EDITOR-IN-CHIEF: M i c h a e l L . Gross, University of Nebraska — Lincoln
Modifying the geometry of the FT-ICR cell to produce uniform ion acceleration and homogeneous dc trapping fields results in enhanced sensitivity and resolution. Curtiss D. Hanson, Department of Chemistry, University of Northern Iowa, Cedar Falls, IA 50614 and Mauro E. Castro, Eric L. Kerley, and David H. Russell*, Department of Chemistry, Texas A&M University, College Station, TX 77843
ASSOCIATE EDITORS: Kelsey D . C o o k , University of Tennessee S i m o n Gaskell, Baylor Medical College Gary L . Glish, Oak Ridge National Laboratory R.S. H o u k , Iowa State University
Combustion Tube Method for Measurement of Nitrogen Isotope Ratios Using Calcium Oxide for Total Removal of Carbon Dioxide and Water 526
KMflMUL OF THE AMERICAN SOCim FOR MASS SPECTROMETRY
T h e Journal o f the A m e r i c a n S o c i e t y for Mass S p e c t r o m e try publishes refereed, original research papers from all fields of scientific: inquiry in which mass spectrometry can play a role, including developments in both fundamentals and applications. C o n t r i b u t o r s investigate new instrumentation and methods, present new discoveries in ion chemistry, and develop p r o b l e m solving strategies. T h e Journal also publishes Short Communications, which contain ideas tor which some experimental or theoretical justification is presented (usually to be followed by a hill paper), and Accounts and Perspectives, including brief review articles and reflections on the state of research in mass spectrometry. 1990, Volume 1 (six issues) ISSN: 1044-0305 Subscription rate: $235.00 (outside USA, add S24.00 for postage). Send North American sample copy requests and all subscription orders to: Elsevier Science Publishing Co., Inc., P.O. Box 882. Madison Square Station, New York, NY 10159. Send all other sample copy requests to: Elsevier Science Publishers, P.O. Box 211. 1000 AE Amsterdam, The Netherlands For fastest service when subscribing or requesting a sample issue, call (212) 633-3950, or FAX your request to (212) 633-3990.
IXSAY
Elimination of z-Ejection in Fourier Transform Ion Cyclotron Resonance Mass Spectrometry by Radio Frequency Electric Field Shimming 515 Relative abundances of ions with different m/z values are determined accurately from FT-ICR mass spectral peak magnitudes. Mingda Wang and Alan G. Marshall*, Department of Chemistry, The Ohio State University, 120 West 18th Avenue, Columbus, OH 43210
ENVIRORENTAL® 689 North James Rood
Asphaltenes in crude oils act as absorbers, not scatterers, in the near-IR spectral range. Addition of spectra from the asphaltene and maltene fractions of a crude oil reproduce the spectrum of the crude oil. Oliver C. Mullins, Schlumberger-Doll Research, Old Quarry Road, Ridgefield, CT 06877
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CIRCLE 32 ON READER SERVICE CARD 298 A · ANALYTICAL CHEMISTRY, VOL. 62, NO. 5, MARCH 1, 1990
7 15 N values produced by the combustion method differ by 0.11%o when compared with conventional methods. Because the gas contains less CO, the values are more accurate than those obtained by previously reported methods. Carol Kendall* and Elizabeth Grim, U.S. Geological Survey, 431 National Center, Reston, VA 22092 Suspended Trapping Procedure for Alleviation of Space Charge Effects in Gas Chromatography/Fourier Transform Mass Spectrometry 530 Low-ppm mass measurement accuracy over a 5 order of magnitude neutral concentration range is demonstrated for the FT-MS detection of gas chromatographic effluent. Jeremiah D. Hogan and David A. Laude, Jr.*, Department of Chemistry, The University of Texas at Austin, Austin, TX 78712
