Record Display for the EPA National Library Catalog


Main Title Vechicle-Related Hydrocarbon Source Compositions from Ambient Data: The GRACE/SAFER Method.
Author Henry, R. C. ; Lewis, C. W. ; Collins, J. F. ;
CORP Author University of Southern California, Los Angeles. Environmental Engineering Program.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.
Publisher c1994
Year Published 1994
Report Number EPA-R-818410; EPA/600/J-94/309;
Stock Number PB94-192762
Additional Subjects Hydrocarbons ; Air pollution sampling ; Chemical composition ; Reprints ; Air pollution dispersion ; Environmental transport ; Gasoline vapors ; Evaporative emissions ; Exhaust emissions ; Evaporative emission measurement ; Exhaust emission measurement ; Gas chromatography ; Air pollution monitoring ; Air pollution sources ; Vehicle air pollution ; Multivariate analysis ; Volatile organic compounds ; GRACE(Graphical Ratio Analysis for Composition Estimates) ; SAFER(Source Apportionment by Factors with Explicit Restrictions) ; Graphical analysis
Library Call Number Additional Info Location Last
NTIS  PB94-192762 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 13p
The composition of three volatile hydrocarbon sources (emissions from vehicles in motion, evaporation of whole gasoline, and gasoline headspace vapor) have been derived from 550 ambient, hourly concentration measurements of 37 C2-C9 volatile organic compounds (VOC). The source compositions were obtained by a novel combination of graphical analysis and multivariate receptor modeling methodologies: GRACE (Graphical Ratio Analysis for Composition Estimates) and SAFER (Source Apportionment by Factors with Explicit Restrictions). For the relatively unreactive hydrocarbon species, the ambient-derived source compositions were in good agreement with direct source measurements made in Atlanta concurrent with the ambient measurements. The prominence of the whole gasoline profile in the ambient data was an unexpected result.