Journal
PEST MANAGEMENT SCIENCE
Volume 61, Issue 9, Pages 899-904Publisher
JOHN WILEY & SONS LTD
DOI: 10.1002/ps.1105
Keywords
soil columns; pesticide leaching; extractable residues; bound residues; soil pollution; water pollution
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A soil column experiment under outdoor conditions was performed to monitor the fate of C-14-ring-labefled sulcotrione, 2-(2-chloro-4-mesylbenzoyl)cyclohexane-1,3-dione and atrazine, 6-chloroN N-2 -ethyl-N-4-isopropyl-1,3,5-triazine-2,4-diamine, in water leachates and in the ploughed horizon of a sandy loam soil. Two months after treatment, the cumulative amounts of herbicide residues leached from the soil were 14.5% and 7% of the applied radioactivity for sulcotrione and atrazine, respectively. Maximum leachate concentrations for each herbicide were observed during the first month following application: 120 and 95 mu g litre(-1) for sulcotrione and atrazine respectively. After 2 weeks, 78% of the sulcotrione and atrazine was extractable from the soil, whereas after two months only 10 and 4%, respectively, could be extracted. The maximum sulcotrione content in the first 10 cm of soil was identical with that of atrazine. For both molecules, the content of non-extractable residues was low, being around 15%. Sulcotrione seems to be more mobile than atrazine but the consequences for water contamination are similar since lower doses are used. (c) 2005 Society of Chemical Industry.
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