Abstract

The strength of adsorptivity of a chemical to soils, koc, is expected to have constant value for chemical in adsorption to soil, however, the koc value of this chemical proved to be different in different kinds of soil. In this investigation, the relationship between kd and Coc can be expressed as kd = Koc · Coc+ α for five kinds of soil and five kinds of chemicals, where Koc is defined as an ‘average’ of the contribution of organic matter to kd and intercept α expresses a fraction of adsorption by soil constituents other than organic carbons. The ratio Koc to koc was found to be nearly constant for each type of soil for different chemical species.

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