Abstract
Vapor sorption of volatile organic chemicals (VOC) to soil minerals becomes the dominant VOC sorption mechanism at low soi!-water contents, but is not include? in traditional VOC transport and fate models. A two-parameter m?del for tnc~lo~oethylene (TCE) vapor sorptIon as a function of soil-water content is sug gested, and expressIOns for predIctIng the model parameters as function of soil type (cation exchange capacity (CEC)) are developed based on measurements for 15 soils from the literature. The vapor sorption model was used in combi~ation with a two-dimensional VOC transport model to evaluate the effect of vapor sorption on TCE transport In the unsatu~at~d z~ne u~der both natural conditions and in connection with soil vapor extraction systems. The effects of vanattons In soIl-water content, soil CEC, and soil-vapor extraction rate were investi gated. Temporal and spatial variations in soil-water content caused pronounced fluctuations in the volatilization of TCE t? the atmos~here. ~oil ~ype (CEC) strongly affected vapor sorption and controlled TCE transport under d~ condItIons. The. slm.ulatl?ns I~ply that vapor sorption can result in increased clean-up times, especially when USIng vapor extractIOn 111 and regIOns.
Published Version
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