Leaching properties of some degradation products of alachlor and metolachlor

Citation
L. Fava et al., Leaching properties of some degradation products of alachlor and metolachlor, CHEMOSPHERE, 41(9), 2000, pp. 1503-1508
Citations number
23
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Environment/Ecology
Journal title
CHEMOSPHERE
ISSN journal
0045-6535 → ACNP
Volume
41
Issue
9
Year of publication
2000
Pages
1503 - 1508
Database
ISI
SICI code
0045-6535(200011)41:9<1503:LPOSDP>2.0.ZU;2-U
Abstract
Once in soil, pesticides undergo degradation processes that give rise to a complex pattern of metabolites. Those presenting a significant percentage o f formation, genotoxic and leaching properties may pose a threat to human h ealth associated with the consumption of drinking water. The aim of this st udy is to assess the hazard potential of some metabolites that may occur in ground water. 2,6-diethylaniline, 2-chloro-2',6'-diethylacetanilide, 2-hyd roxy-2',6'-diethylacetanilide, metabolites of alachlor and 2-ethyl-6-methyl aniline, metabolite of metolachlor, were chosen for their genotoxic propert ies. Under laboratory conditions, these metabolites showed DT50 = 1-5 days and K-oc = 45-357. Their leaching potential, calculated according to Gustaf son, is very low and, therefore, they should not be regarded as contaminant s of ground waters. Aged residue leaching studies as well as preliminary st udies on well waters seem to confirm these findings. (C) 2000 Elsevier Scie nce Ltd. All rights reserved.