MOLECULAR ANALYSIS OF SULFATE SPECIES IN ENVIRONMENTAL AEROSOLS USING CHEMICAL IONIZATION MASS SPECTROMETRY

Speciation of sulfurous acid, sulfuric acid and ammonium sulfate collected from the aerosol phase on a Fluoropore filter has been readily accomplished using techniques of chemical ionization mass spectrometry combined with thermal separation. Thermal separation of ammonium hydrogen sulfate from ammonium sulfate was not possible. Sulfuric acid aerosol was rapidly converted to ammonium sulfate or ammonium hydrogen sulfate in the presence of ambient concentrations of ammonia. Ambient samples collected in the Detroit metropolitan area have been found to contain only trace quantities of sulfuric acid. Sulfate samples collected from a dilution tube into which catalyzed vehicle exhaust was injected were found to contain significant quantities of ammonium sulfate in addition to sulfuric acid. The rate of sulfate specie volatilization from the filter media was found to be markedly affected by the ammonium sulfate particle size on the filter, thus necessitating the generation of appropriate standards. Impregnation of the collection filter with an appropriate material that will convert sulfuric acid upon collection to a species which is unaffected by ambient ammonia concentrations can permit subsequent quantitation of ambient H//2SO//4 by mass spectrometry.

  • Corporate Authors:

    Society of Automotive Engineers

    400 Commonwealth Drive
    Warrendale, PA  USA  15096
  • Authors:
    • Harvey, T M
    • Schuetzle, D
  • Publication Date: 1977-3

Media Info

  • Features: References;
  • Pagination: 6 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00158327
  • Record Type: Publication
  • Source Agency: Engineering Index
  • Report/Paper Numbers: SAE 770063 Preprint
  • Files: TRIS
  • Created Date: Oct 13 1977 12:00AM