INTERACTION OF CHLORDIMEFORM WITH THE CLAY FRACTION OF A VARIABLE-CHARGE SOIL

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Abstract
In this paper, we report on the interaction of the cationic pesticide chlordimeform with the clay fraction of a soil of variable charge. The soil used was classified as an Alfic Dystric Eutrocrept, with the following mineralogical composition: illite, talc, chlorite, vermiculite, goethite, maghemite, hematite, and lepidocrocite. Iron components dominate the clay fraction and silicates are present in lesser proportion, but the results show that the silicates have an important influence on the adsorption process. The variation of the electric surface charge with pH produces the rise in adsorption as pH increases, and changes in surface area produced by heating also cause an increase of pesticide adsorption.