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The environmental impact of pesticide degradates in groundwater



The environmental impact of pesticide degradates in groundwater



Meyer, M. T. , Thurman, E. M. Acs Symposium Series; Herbicide Metabolites In Surface Water And Groundwater: 200-225



Pesticide environmental fate and ground-water monitoring studies often only analyze for residues of parent. Yet available environmental fate data for many pesticide degradates indicate a higher propensity to leach in soil than the respective parent compound. Even in cases where no mobile degradate has been found to accumulate in soil to any great extent (generally true with s-triazine and acetanilide herbicides, for example), the existence of a chemically stable molecular "core" is an indicator that some degradates could reach ground water. Recent studies with atrazine and alachlor have demonstrated that quantities of degradates in ground water may exceed (sometimes by a great amount) the quantities of the parent compound. Ground-water monitoring for newer, low-rate pesticides such as sulfonylurea herbicides and their degradates is almost nonexistent. These low-rate herbicides have environmental fate properties indicating they may be more mobile in soil than some pesticides that have already been found to impact ground water at numerous locations. In cases where degradates are found to be of toxicological significance, use limitations might be needed to mitigate impact of the degradates on ground water.

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Accession: 002985715

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