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RECORD NUMBER: 11 OF 20

OLS Field Name OLS Field Data
Main Title Nitric Acid-Nitrate Aerosol Measurements by a Diffusion Denuder: A Performance Evaluation.
Author Durham, J. L. ; Spiller, L. L. ; Ellestad, T. G. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Atmospheric Sciences Research Lab.
Year Published 1987
Report Number EPA/600/J-87/177;
Stock Number PB88-161831
Additional Subjects Nitric acid ; Nitrates ; Aerosols ; Performance evaluation ; Reprints ; Diffusion denuder
Holdings
Library Call Number Additional Info Location Last
Modified
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Status
NTIS  PB88-161831 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 06/21/1988
Collation 12p
Abstract
A nitric acid diffusion denuder made of nylon was operated in Riverside, CA, Houston, TX, and Claremont, CA. The pre-exponential and diffusion coefficients for the first term of the Gormley-Kennedy equation were estimated by regressing the log (mass deposited) against the axial distance from the entrance of the denuder. The field study average values of the two coefficients were compared by the two-tail t-test to the average values for the HNO3-Air system determined in the laboratory; the test revealed that the means of the diffusion coefficients have probabilities less than or equal to 0.03 of being equal. The nitrate ion mass patterns in the denuder for the field cases do not adhere to the Gormley-Kennedy model applied to the simple HNO3-Air system. The source of excess nitrate deposited in the nylon tube could not be identified by the analysis. Candidate sources are deposition of gaseous N-compounds (analyzed as nitrate) other than nitric acid and evaporation of nitric acid from particles during transit in the denuder tube.