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This article in SSSAJ

  1. Vol. 41 No. 3, p. 519-523
    Received: Sept 30, 1976
    Accepted: Jan 3, 1977

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

  1. U. Mingelgrin,
  2. Sarina Saltzman and
  3. B. Yaron2



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.

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