- Leaching properties of some degradation products of alachlor and metolachlor
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Once in soil, pesticides undergo degradation processes that give rise to a complex pattern of metabolites. Those presenting a significant percentage of formation, genotoxic and leaching properties may pose a threat to human health associated with the consumption of drinking water. The aim of this study is to assess the hazard potential of some metabolites that may occur in ground water. 2,6-diethylaniline, 2-chloro-2',6'-diethylacetanilide, 2- hydroxy-2',6'-diethylacetanilide, metabolites of alachlor and 2-ethyl-6- methylaniline, metabolite of metolachlor, were chosen for their genotoxic properties. Under laboratory conditions, these metabolites showed DT50 = 1- 5 days and K(oc) = 45-357. Their leaching potential, calculated according to Gustafson, is very low and, therefore, they should not be regarded as contaminants of ground waters. Aged residue leaching studies as well as preliminary studies on well waters seem to confirm these findings. (C) 2000 Elsevier Science Ltd.
- Fava,Bottoni,Crobe,Funari
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- Occurrence of alachlor environmental degradation products in groundwater
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Groundwater samples collected beneath a Massachusetts corn field were analyzed by gas chromatography/mass spectrometry. In addition to alachlor, 20 compounds were detected whose EI and CIMS data indicated that they were derived from alachlor, presumably via environmental degradation. Structural assignments were confirmed for six of these compounds by analysis of standards. They were among 10 alachlor-related compounds that were synthesized by use of either the parent compound or 2,6-diethylaniline as starting material. -from Authors
- Potter,Carpenter
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p. 1557 - 1563
(2007/10/03)
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