Abstract
The sorptional behaviour of an organophosphorus pesticide, Malathion, has been investigated by an experiment designed to assess the effects of variations in pesticide concentrations as well as of environmental influences on sediment samples from a tropical estuary. Three different sediment samples were exposed to varying concentrations of Malathion for different periods of time. The experimental data were subjected to simple regressional analysis and the results were analysed by the Freundlich, Elovich and Langmuir models. It was observed that the Malathion adsorption was essentially a heterogenous multi-layer interaction. The relevance of solubility and partition coefficient of the solute, organic carbon content of the sediment as well as the energetics involved in controlling and regulating the sorption process have been examined.
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