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Chemical volatilization from the soil matrix Transport through the air and water phases

, : Chemical volatilization from the soil matrix Transport through the air and water phases. Journal of Hazardous Materials 37(3): 445-457

A convenient theoretical approach is presented for the estimation of the fraction of a chemical volatilization flux from the soil matrix which is attributable to the various soil phases. Specifically, for a soil matrix consisting of soil—air, soil—water, and soil—solids, a volatilization index is defined which relates the contribution of these soil phases to the chemical volatilization flux from the soil. For the special case of local equilibrium among the soil phases and where diffusive transport dominates the volatilization index is shown to be a function of the chemical molecular diffusion coefficients in air and water, the Henry's law constant and the soil—water saturation. The application of the volatilization index is demonstrated, for the above limiting case, using basic physicochemical parameters for a number of different compounds.


DOI: 10.1016/0304-3894(93)e0100-g

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