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A Possible Model for the Surface-induced Hydrolysis of Organophosphorus Pesticides on Kaolinite Clays¹

ABSTRACT

A model for the hydrolysis of organophosphorus pesticides on clay surfaces is proposed; organophosphate ester molecules are susceptible to hydrolysis of the phosphate ester bond, whereby they are rapidly degraded on the kaolinite surfaces. It is suggested that the organophosphorus molecules undergo hydrolysis by the ligand water associated with the counter ions. Consequently, the degradation process is dependent on the nature of the saturating cation and its hydration status.

¹ Contribution from the Agric. Res. Organization, The Volcani Center, Bet Dagan, Israel. 1975 Series, no. 240-E.

² Senior Scientist, Scientist, and Senior Scientist, respectively, Division of Soil Residues Chemistry, Institute of Soils & Water, ARO, The Volcani Center, Bet Dagan, Israel. The first author is also affiliated with the Dep. of Chemical Physics, the Weizmann Inst. of Sci., Rehovot, Israel.

Received for publication September 30, 1976. Accepted for publication January 3, 1977.