Abstract
Abstract As part of an investigation of the factors influencing the interaction of different classes of pesiticides with humic substances, a study was made of the role of the following physicochemical variables on the adsorption of a typical non-polar pesticide (lindane) by a calibrated fulvic acid fraction which can exist in both colloidal solution and in precipitated form: degree of protonation; ionic atmosphere; and extent of humic matter aggregation. Using the fulvic acid as a typical humic material, and the experimental parameters of pH and ionic strength, along with ultrafiltration techniques, we were able to demonstrate the importance of these physicochemical variables on binding of lindane. From these results predictions could be made about binding mechanisms and environmental implications. The findings are likely to be applicable to all non-polar pesticides having aqueous solubility similar to that of lindane.
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