Record Display for the EPA National Library Catalog


Main Title Fitting Multimodal Lognormal Size Distributions to Cascade Impactor Data.
Author Dzubay, T. G. ; Hasan., H. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Research and Exposure Assessment Lab. ;Space Telescope Science Inst., Baltimore, MD.
Publisher c1990
Year Published 1990
Report Number EPA/600/J-90/184;
Stock Number PB91-116822
Additional Subjects Aerosols ; Particle size distribution ; Mathematical models ; Statistical distributions ; Monte Carlo method ; Sensitivity ; Reprints ; Lognormal distribution ; Cascade impactors ; Ammonium ions ; Nitrates
Library Call Number Additional Info Location Last
NTIS  PB91-116822 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 9p
A procedure is described for fitting multimodal log-normal size distributions to cascade impactor data. The method was tested by applying it to published cascade impactor measurements for ammonium and nitrate that were previously analyzed by procedures that do not assume a functional form for the size distribution. Small differences between results of the methods are noted. Monte Carlo simulations are used to evaluate the sensitivity of the deduced size distribution parameters to measurement precision and impactor efficiency characteristics. Unbiased parameters and reliable estimates of their uncertainties were obtained when correct specifications of measurement precision and impactor characteristics were used in the analysis. However, when incorrect specifications were used, biased parameters and unreliable uncertainty estimates were obtained.