Record Display for the EPA National Library CatalogRECORD NUMBER: 20 OF 24
|Main Title||Phase Distributions of Airborne Polycyclic Aromatic Hydrocarbons in Two U.S. Cities.|
|Author||Lewis, R. G. ; Kelly, T. J. ; Chuang, J. C. ; Callahan, P. J. ; Coutant, R. W. ;|
|CORP Author||Battelle, Columbus, OH.;Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab.|
|Publisher||28 Feb 92|
|Additional Subjects||Air pollution monitoring ; Aromatic polycyclic hydrocarbons ; Mobile pollutant sources ; Stationary sources ; Urban areas ; Air samplers ; Particulates ; Vapors ; Seasonal variations ; Boston(Massachusetts) ; Houston(Texas) ; Phase distribution|
Ambient air concentrations of 18 polycyclic aromatic hydrocarbons (PAHs) were monitored in Boston, Massachusetts and Houston, Texas. The PAHs were generated by fossil fuel and wood combustion, motor vehicle traffic, oil refineries, or other sources. Since PAHs may exist in air both as vapors and adsorbed on particles a denuder sampler that denudes the air of vapors and collects only particles was operated next to a traditional sampler at each site from August 27, 1990 to August 27, 1991. Phase distributions were determined on a seasonal basis. A significant proportion of each PAH was found to be in the vapor phase. The amount volatilized from the particles depended on vapor presure, atmospheric concentration of the PAH, and ambient temperature.