Record Display for the EPA National Library Catalog


Main Title Sampling charged particles with cascade impactors /
Author Farthing, W. E. ; Hussey, D. H. ; Smith, W. B. ; Wilson, Jr, R. R. ;
Other Authors
Author Title of a Work
Farthing, William E.
CORP Author Southern Research Inst., Birmingham, AL.;Industrial Environmental Research Lab., Research Triangle Park, NC.
Publisher U.S. Environmental Protection Agency, Industrial Environmental Research Laboratory ; Available to the public through the National Technical Information Service,
Year Published 1979
Report Number EPA-600/7-79-027; SORI-EAS-79-024; EPA-68-02-2131
Stock Number PB-290 897
OCLC Number 07855674
Subjects Aerosols. ; Particle size determination. ; Electrostatic precipitation.
Additional Subjects Particle size distribution ; Aerosols ; Air pollution control ; Sampling ; Electrostatic precipitators ; Performance evaluation ; Laboratory equipment ; Design criteria ; Cascade impactors ; Procedures
Internet Access
Description Access URL
Library Call Number Additional Info Location Last
EJBD ARCHIVE EPA 600-7-79-027 Headquarters Library/Washington,DC 07/08/2013
EKBD  EPA-600/7-79-027 Research Triangle Park Library/RTP, NC 12/19/2003
ESAD  EPA 600-7-79-027 Region 10 Library/Seattle,WA 10/31/2017
NTIS  PB-290 897 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation ix, 79 pages : illustrations ; 28 cm.
The report discusses three sets of experiments which demonstrate that a cascade impactor sampling a charged aerosol may yield a particle size distribution measurement that deviates from the time distribution. The distributions indicated more large particles and fewer small particles than actually existed, due to the particles' attraction to the grounded impactor plates (stages). Although higher charge levels produced larger deviations from the true size distribution, the magnitude of the deviation and the corresponding correction factor for any given charged aerosol are unpredictable. Also, the error was smaller if glass fiber substrates were used as collection surfaces instead of bare metal. For electrostatic precipitators operating at normal charging conditions (an electric field of 400,000 V/m and a current density of 0.0003 A/sq m/s), the size distribution (measured by the lower stages of an Andersaen cascade impactor with glass fiber substrates) was not significantly different from the true size distribution.
"Southern Research Institute." "Industrial Environmental Research Laboratory, Office of Energy, Minerals, and Industry." "January 1979." Includes bibliographical references. "Contract no. 68-02-2131, T.D. 10401 and 11301, program element no. EHE624."