Estimation of adsorbed amounts of volatile chlorinated organic compounds to wet soil based on the properties of the compounds and soils

The adsorption equilibriums of 7 volatile organic chlorinated compounds to 10 wet soils were investigated by continuous flow adsorption experiments. The adsorption equilibriums for the wet soils could be expressed by the Henry equation. The most part of the adsorbed amount existed on the organic substances in the soil, and the soil–water adsorption equilibrium constant could be estimated from the organic carbon content of the soil. The adsorption coefficient to the organic carbon of the chloroethylenes and chloroethanes could be expressed by the functions of the n-octanol/water partition coefficient, respectively. The adsorbed amounts could be estimated using equations relating the organic content and the water content of each soil, and the n-octanol/water partition coefficient and the Henry constant for the gas–water equilibrium of each compound. The estimated results agreed well with the measured data.