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SOME ASPECTS OF SURFACE INTERACTIONS OF CLAYS WITH ORGANOPHOSPHORUS PESTICIDES

The paper deals with the surface interactions of some organophosphorus pesticides (parathion, methyl parathion, pirimiphos ethyl and methyl menazon, diazinon DDVP) with montmorillonite, kaolinite, and attapulgite clays. 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 is 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.