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Please use this identifier to cite or link to this item: http://hdl.handle.net/10373/1092

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Title: Facilitated transport of diuron and glyphosate in high copper vineyard soils
Authors: Dousset, Sylvie
Jacobson, Astrid R.
Dessogne, Jean-Baptiste
Guichard, Nathalie
Baveye, Philippe C.
Andreux, Francis
Affiliation: University of Abertay Dundee. Scottish Informatics, Mathematics, Biology and Statistics Centre
Keywords: Diuron
Glyphosate
Copper
Issue Date: Dec-2007
Publisher: American Chemical Society
Type: Journal Article
Refereed: peer-reviewed
Rights: Published version (c)American Chemical Society, available from http://www.ncbi.nlm.nih.gov/pubmed/18186337
Citation: Dousset, S., et al. 2007. Facilitated transport of diuron and glyphosate in high copper vineyard soils. Environmental Science and Technology. 41(23): pp.8056-8061. Available from http://www.ncbi.nlm.nih.gov/pubmed/18186337
Abstract: The fate of organic herbicides applied to agricultural fields may be affected by other soil amendments, such as copper applied as a fungicide. The effect of copper on the leaching of diuron and glyphosate through a granitic and a calcareous soil was studied in the laboratory using sieved-soil columns. Each soil was enriched with copper sulfate to obtain soil copper concentrations of 125, 250, 500, and 1000 mg kg(-1). Glyphosate leaching was influenced by soil pH and copper concentration, whereas diuron leaching was not. In the calcareous soil, glyphosate leaching decreased as copper levels increased from 17 mg kg(-1) (background) to 500 mg kg(-1). In the granitic soil, glyphosate leaching increased as copper levels increased from 34 mg kg(-1) (background) to 500 mg kg(-1). The shapes of the copper elution curves in presence of glyphosate were similar to shapes of the glyphosate curves, suggesting the formation of Cu-glyphosate complexes that leach through the soil. Soil copper concentration does not influence diuron leaching. In contrast, increasing copper concentrations reduces glyphosate leaching through calcareous soils, and conversely, increases glyphosate leaching through granitic soils. Our findings suggest that the risk of groundwater contamination by glyphosate increases in granitic soils with elevated copper concentrations.
URI: http://hdl.handle.net/10373/1092
ISSN: 0013-936X
Appears in Collections:SIMBIOS Collection

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