Record Display for the EPA National Library Catalog

RECORD NUMBER: 46 OF 73

OLS Field Name OLS Field Data
Main Title Origin of Carbonaceous Particles in American Cities: Results of Radiocarbon 'Dating' and Chemical Characterization.
Author Currie, L. A. ; Klouda, G. A. ; Continetti, R. E. ; Kaplan, I. R. ; Wong, W. W. ;
CORP Author National Bureau of Standards (NML), Gaithersburg, MD. Center for Analytical Chemistry. ;Global Geochemistry Corp., Canoga Park, CA.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Sciences Research Lab.
Year Published 1983
Report Number EPA/600/J-83/307;
Stock Number PB85-229201
Additional Subjects Chemical analysis ; Particles ; Air pollution ; Radiocarbon dating ; Chemical properties ; Sources ; Urban area ; Visibility ; Physical properties ; Carbon 14 ; Carbon 13 ; Reprints ; Receptor models
Holdings
Library Call Number Additional Info Location Last
Modified
Checkout
Status
NTIS  PB85-229201 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/21/1988
Collation 14p
Abstract
During the past three years radiocarbon assay has emerged as a primary tool in the quantitative assignment of sources of urban and rural particulate pollution. Its use in several major field studies has come about because of its excellent (fossil/biogenic) discriminating power, because of advances in (14)C measurements of small samples, and because of the increased significance of carbonaceous particles in the atmosphere. The problem is especially important in the cities, where increased concentrations of fine particles lead to pollution episodes characterized by poor visibility and changes in the radiation balance (absorption, scattering), and immediate and possibly long-term health effects. Efforts in source apportionment in such affected areas have been based on emissions inventories, dispersion modeling, and receptor modeling, i.e., chemical and physical (and statistical) characterization of particles collected at designated receptor sites. It is in the last category that (14)C has become quite effective in helping to resolve particle sources. Results are presented for studies carried out in Los Angeles, Denver, and Houston which incorporated (14)C measurements, inorganic and organic chemical characterization, and receptor modeling. The (14)C data indicated wide ranging contributions of biogenic and fossil carbon sources -- e.g., <10% to 60% contemporary (biogenic) in Houston -- depending on meteorological, biological, and anthropological activity.