Record Display for the EPA National Library Catalog

RECORD NUMBER: 14 OF 73

OLS Field Name OLS Field Data
Main Title Critical Evaluation of the Diffusion Hypothesis in the Theory of Porous Media Volatile Organic Compound (VOC) Sources and Sinks.
Author Dunn, J. E. ; Chen., T. ;
CORP Author Arkansas Univ., Fayetteville. Dept. of Mathematical Sciences.;Environmental Protection Agency, Research Triangle Park, NC. Air and Energy Engineering Research Lab.
Publisher c1993
Year Published 1993
Report Number EPA/600/J-94/118;
Stock Number PB94-159019
Additional Subjects Indoor air pollution ; Diffusion ; Porous materials ; Reprint ; Mathematical models ; Isotherms ; Stationary sources ; Organic compounds ; Least squares method ; Carpets ; Ethyl benzene ; Emission ; Statistical analysis ; Environmental exposure ; VOCs(Volatile organic compounds) ; Perchloroethylene
Holdings
Library Call Number Additional Info Location Last
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Status
NTIS  PB94-159019 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 09/01/1994
Collation 18p
Abstract
The paper proposes three alternative, diffusion-limited mathematical models to account for this interaction, using the linear isotherm model as a reference point. Their taxonomy is keyed to the nature of the vapor-sink interface. While the linear isotherm model gave an adequate description of data when a pillow-sink was challenged with ethylbenzene, a new single-parameter diffusion model gave a much improved description of data when the same pillow-sink was challenged with perchloroethylene. A hybrid, sorption/desorption, diffusion-limited model was the only plausible model when a carpet-sink was challenged with ethylbenzene. Some new computational aids, particularly interval-weighted least squares, are introduced in the context of model validation. (Copyright (c) American Society for Testing and Materials 1993.)