Record Display for the EPA National Library Catalog


Main Title Analysis of Ambient Polar Volatile Organic Compounds Using Chemical Ionization-Ion Trap Detector.
Author Gordon, S. M. ; Miller, M. ;
CORP Author IIT Research Inst., Chicago, IL.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Publisher May 89
Year Published 1989
Report Number EPA 68-D8-0002; EPA/600/3-89/070;
Stock Number PB90-106451
Additional Subjects Cryogenics ; Ion traps(Instrumentation) ; Ionization ; Trace elements ; Ambient conditions ; Chromatographic analysis ; Water vapor ; Polarity ; Volatile organic compounds
Library Call Number Additional Info Location Last
NTIS  PB90-106451 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 37p
The current approach to measuring trace levels of volatile organic compounds (VOCs) in ambient air requires cryogenic trapping of the analytes, followed by thermal desorption and low-temperature refocusing onto a column for analysis by capillary gas chromatography/mass spectrometry (GC/MS). The approach has been successfully applied to nonpolar VOCs, but its use for more polar species has been complicated by the problems associated with the ambient water vapor collected with the VOCs. A promising technique for measuring polar VOCs is chemical ionization GC/MS (GC/CI-MS) in the quadrupole ion trap. The approach allows whole air samples to be taken since the water present in the air is used as the CI reagent gas. Water CI leads to appreciable intensities for the proton transfer agent H3O+, which produces intense pseudomolecular ions and class-specific fragmentation patterns for various low molecular weight polar compounds. Standard mixtures of polar species at low concentrations in humidified zero air were analyzed without a membrane dryer, using a cryogenic trap and CI-GC/MS with the ion trap detector in the full scan model.