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Occurrence of metolachlor and trifluralin losses in the Save river agricultural catchment during floods

Boithias, Laurie and Simeoni-Sauvage, Sabine and Taghavi, Lobat and Merlina, Georges and Probst, Jean-Luc and Sanchez-Pérez, José Miguel Occurrence of metolachlor and trifluralin losses in the Save river agricultural catchment during floods. (2011) Journal of Hazardous Materials, 196. 210-219. ISSN 0304-3894

(Document in English)

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Official URL: http://dx.doi.org/10.1016/j.jhazmat.2011.09.012


Rising pesticide levels in streams draining intensively managed agricultural land have a detrimental effect on aquatic ecosystems and render water unfit for human consumption. The Soil and Water Assessment Tool (SWAT) was applied to simulate daily pesticide transfer at the outlet from an agriculturally intensive catchment of 1110 km2 (Save river, south-western France). SWAT reliably simulated both dissolved and sorbed metolachlor and trifluralin loads and concentrations at the catchment outlet from 1998 to 2009. On average, 17 kg of metolachlor and 1 kg of trifluralin were exported at outlet each year, with annual rainfall variations considered. Surface runoff was identified as the preferred pathway for pesticide transfer, related to the good correlation between suspended sediment exportation and pesticide, in both soluble and sorbed phases. Pesticide exportation rates at catchment outlet were less than 0.1% of the applied amount. At outlet, SWAT hindcasted that (i) 61% of metolachlor and 52% of trifluralin were exported during high flows and (ii) metolachlor and trifluralin concentrations exceeded European drinking water standards of 0.1 µg L−1 for individual pesticides during 149 (3.6%) and 17 (0.4%) days of the 1998–2009 period respectively. SWAT was shown to be a promising tool for assessing large catchment river network pesticide contamination in the event of floods but further useful developments of pesticide transfers and partition coefficient processes would need to be investigated.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at : http://www.sciencedirect.com/science?_ob=ArticleListURL&_method=list&_ArticleListID=1950820260&_sort=r&_st=13&view=c&_acct=C000043979&_version=1&_urlVersion=0&_userid=4373306&md5=b32a4430b4c4102f9aeb49545491e757&searchtype=a
HAL Id:hal-03542311
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Laboratory name:
EU Interreg SUDOE IVB program - ERDF - Midi-Pyrénées Region
Deposited On:12 Apr 2012 15:19

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