SOME ASPECTS OF SURFACE INTERACTIONS OF CLAYS WITH ORGANOPHOSPHORUS PESTICIDES

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Abstract
The surface interactions of some organophosphorus pesticides (parathion, methyl parathion, pirimiphos ethyl and methyl menazon, diazinon) with montmorillonite, kaolinite and attapulgite clays were investigated. Pesticide adsorption by clay minerals is affected by the molecular structure of the chemical, type of clay and its saturating cation, hydration status of the mineral and the environmental temperature. The desorption rate of the chemical absorbed on the clays'' surface into the water phase in affected by the properties of the chemicals and the type of clay. Direct hydrolysis or hydrolysis after a previous rearrangement are conversion processes catalyzed by the clays'' surfaces. The extent and nature of the conversion are affected by the hydration status of the clay mineral.

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