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Main Title Photochemical aerosol dynamics /
Author Friedlander, Sheldon K.
Other Authors
Author Title of a Work
Friedlander, Sheldon K.
Durham, Jack L.
CORP Author California Inst. of Tech., Pasadena. Dept. of Chemical Engineering.;Environmental Sciences Research Lab., Research Triangle Park, NC.
Publisher Environmental Sciences Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency,
Year Published 1979
Report Number EPA 600-3-79-052; EPA-R-802160; PB299212
Stock Number PB-299 212
OCLC Number 52642688
Subjects Aerosols ; Air--Pollution ; Photochemistry--Research
Additional Subjects Air pollution ; Aerosols ; Photochemical reactions ; Particle size distribution ; Reaction kinetics ; Cyclopentene ; Cyclohexene ; Particles ; Sulfates ; Inorganic nitrates ; Nucleation ; Organic compounds ; Smog ; Atmospheric chemistry ; Heterogeneous reactions ; Homogeneous reactions ; Octadiene
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EHAM  EPA-600/3-79-052 Region 1 Library/Boston,MA 05/25/2016
EJBD  EPA 600-3-79-052 Headquarters Library/Washington,DC 01/09/2020
EKBD  EPA-600/3-79-052 Research Triangle Park Library/RTP, NC 07/18/2003
ELBD ARCHIVE EPA 600-3-79-052 Received from HQ AWBERC Library/Cincinnati,OH 10/04/2023
ERAD  EPA 600/3-79-052 Region 9 Library/San Francisco,CA 10/22/2012
ESAD  EPA 600-3-79-052 Region 10 Library/Seattle,WA 03/23/2010
NTIS  PB-299 212 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation vii, 38 pages : illustrations ; 28 cm
New data are reported on (1) the rate of formation of condensable chemical species by photochemical reactions, (2) the effect of the reaction products on the particle size distribution and (3) the distribution of reaction products as a function of particle size. Gas-to-particle conversion for cyclopentene, cyclohexene and 1,7--octadiene, ranged from 5 to 39 percent of the initial gas-phase carbon concentrations. Size distribution data for cyclohexene were correlated by a diffusion controlled growth law with Kelvin cutoff diameter at about 0.25 micrometer. In polluted atmospheres, some new particle formation takes place as a result of homogeneous gas phase reactions even though an aerosol is already present. To explain the results of laboratory studies of this phenomenon, classical nucleation theory must be modified to take into account the scavenging of clusters by the aerosol. Using a new low pressure impactor, the first measurements have been made of the distributions of sulfate and nitrate with respect to particle size for dp < 0.25 micrometer. In Pasadena, the data for sulfate often show a peak in the mass distribution for 0.6 < dp < 1.0 micrometer; less often, a peak is observed near 0.1 micrometer, consistent with laboratory data for aerosols formed by homogeneous gas phase reactions.
Project Officer: Jack L. Durham. "EPA 600-3-79-052." "May 1979." Cover title. Includes bibliographical references. California Institute of Technology