||Soil Sorption of Organic Vapors and Effects of Humidity on Sorptive Mechanism and Capacity.
Chiou, C. T. ;
Shoup, T. D. ;
||Geological Survey, Denver, CO. ;Oregon State Univ., Corvallis.;Corvallis Environmental Research Lab., OR.
Organic compounds ;
Vapor phases ;
Soil chemistry ;
Water vapor ;
Displacement reactions ;
Mathematical models ;
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||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.)
||Pub. in Environmental Science and Technology, v19 n12 p1196-1200 Dec 85. Prepared in cooperation with Oregon State Univ., Corvallis. Sponsored by Corvallis Environmental Research Lab., OR.
|NTIS Title Notes
||Reprint: Soil Sorption of Organic Vapors and Effects of Humidity on Sorptive Mechanism and Capacity.
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||PC A02/MF A01