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OLS Field Name OLS Field Data
Main Title Soil Sorption of Organic Vapors and Effects of Humidity on Sorptive Mechanism and Capacity.
Author Chiou, C. T. ; Shoup, T. D. ;
CORP Author Geological Survey, Denver, CO. ;Oregon State Univ., Corvallis.;Corvallis Environmental Research Lab., OR.
Year Published 1985
Report Number EPA-R-808046; EPA/600/J-85/291;
Stock Number PB86-166048
Additional Subjects Organic compounds ; Vapor phases ; Humidity ; Sorption ; Soil chemistry ; Concentration(Composition) ; Benzene ; Chlorobenzenes ; Water vapor ; Displacement reactions ; Isotherms ; Mixtures ; Nutrients ; Mathematical models ; Pesticides ; Extraction ; Reprints ; Dry soils
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NTIS  PB86-166048 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 8p
Abstract
Vapor sorption isotherms on dry Woodburn soil at 20-30C were determined for benzene, chlorobenzene, p-dichlorobenzene, m-dichlorobenzene, 1,2,4-trichlorobenzene, and water as single vapors and for benzene, m-dichlorobenzene, and 1,2,4-trichlorobenzene as functions of relative humidity (RH). Isotherms for all compounds on dry soil samples are distinctively nonlinear, with water showing the greatest capacity. Water vapor sharply reduced the sorption capacities of organic compounds with the dry soil; on water-saturated soil, the reduction was about 2 orders of magnitude. The markedly higher sorption on organic vapors at subsaturation humidities is attributed to adsorption on the mineral matter, which predominates over the simultaneous uptake by partition into the organic matter. At about 90% RH, the sorption capacities of organic compounds become comparable to those in aqueous systems. The effect of humidity is attributed to adsorptive displacement by water of organics adsorbed on the mineral matter. (Copyright (c) 1985 American Chemical Society.)