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Pesticide transfers in a small agricultural catchment (Aurade, south west of France) during flood flows: partitioning into dissolved and particulate fractions

Taghavi, Lobat and Marchand, Anne-Laure and Merlina, Georges and Durbe, Gaël and Probst, Anne and Probst, Jean-Luc Pesticide transfers in a small agricultural catchment (Aurade, south west of France) during flood flows: partitioning into dissolved and particulate fractions. (2008) In: Pesticides 2008, 22 au 25 octobre 2008, Marseille . (Unpublished)

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Pesticide transfer dynamic is studied during 2 flood events in a small experimental catchment close to Toulouse (South West of France). 16 to 25 pesticide molecules (herbicides, fungicides) have been analysed by multi-residue technique on filtered and unfiltered waters and on bottom sediments. The results show very high pesticide concentrations in the different fractions compared to low flow periods and to the data collected by the French institutional networks in charge of the pesticide river water pollution survey. Several molecules present concentration higher than 0.1 ug/L and even higher than 1 ug/L in the unfiltered waters. In the suspended matters and in the bottom sediments, the concentrations vary respectively between 0.1-30 ug/g and 0.01 -1 ug/g according to the molecules. All the molecule concentrations increase during the flood flows and present positive relationship with the stream discharge, but hysteresis between rising and falling periods can be observed for some molecules. Pesticide concentrations in unfiltered waters are generally controlled by dissolved organic carbon (DOC) content and total suspended matter (TSM) concentration. Partitioning between dissolved and particulate (Kd) fractions is also controlled by DOC, and TSM. A good negative relationship can be established between log Kd and log Kow for 6 molecules.

Item Type:Conference or Workshop Item (Poster)
Additional Information:Proceedings of the 5th European Conference on Pesticides and Related Organic Micropollutants in the Environment and the 11th Symposium on Chemistry and Fate of Modern Pesticides, Marseille, 22-25 October 2008 available in a special issue of the International Journal of Environmental Analytical Chemistry Volume 90 Issue 3-6 2010 : http://www.informaworld.com/smpp/title~db=all~content=g919777830
Audience (conference):International conference proceedings
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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)
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Deposited On:11 Feb 2011 10:24

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