Adsorption of Pesticides and Their Biodegraded Products on Clay Minerals and Soils.

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Abstract

Adsorption isotherms of 10 pesticides and their biodegradation intermediates on clay minerals and soils were investigated to predict the fate of pesticides in the environment. The adsorption isotherms were expressed by the Freundlich isotherm equation. Pentachloronitrobenzene, 2,4,6-trichlorophenyl-4'-nitro-phenylether, and various intermediates were highly adsorbed on soils, although isoprothiolane was only slightly adsorbed. The adsorbabilities of pesticides on ando soil, gray lowland soil, and montmorillonite were higher than those on allophene and kaolinite. These results can be used to study the fate of pesticides.

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