Record Display for the EPA National Library Catalog

RECORD NUMBER: 7 OF 12

OLS Field Name OLS Field Data
Main Title Mass and Composition of an Urban Aerosol as a Function of Particle Size for Several Visibility Levels.
Author Patterson, Ronald K. ; Wagman., Jack ;
CORP Author Environmental Sciences Research Lab., Research Triangle Park, N.C.
Year Published 1977
Report Number EPA/600/J-77/081;
Stock Number PB-278 342
Additional Subjects Aerosols ; Visibility ; Air pollution ; Sampling ; Metropolitan areas ; New York ; Particle size distribution ; Ions ; Zinc ; Magnesium ; Iron ; Lead(Metal) ; Chlorides ; Chemical analysis ; Fines ; Concentration(Composition) ; Sulfates ; Inorganic nitrates ; Mass ; Ammonium compounds ; Reprints ; Air pollution detection ; New York City(New York) ; Atmospheric transmissivity
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB-278 342 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/23/1988
Collation 13p
Abstract
An atmospheric aerosol sampling analysis experiment at a site near the center of the New York metropolitan area was carried out to delineate relationships existing between degree of visibility and various aerosol characteristics in a polluted atmosphere. Size-fractionated and unfractionated particulate samples were collected at four discrete levels of visibility and analyzed for SO4(-2), NO3(-1), Cl(-1), NH4(+1), Pb, Fe, Mg, Zn and total mass. At all levels of visibility, bimodal or multimodal particle size distributions were observed for total mass and, in some cases, for individual components. Decreased visibility corresponded to increased particle mass concentration especially in the fine particle fraction (ranging in size from about 0.1 to 1.0 micrometer dia.). Increases in the proportion of particulate sulfate and, to a lesser extent, of nitrate, chloride, ammonium, and carbon were also associated with decreased visibility.