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Multi-residues analysis of pre-emergence herbicides in fluvial sediments : application to the mid-Garonne River

Devault, Damien A. and Merlina, Georges and Lim, Puy and Probst, Jean-Luc and Pinelli, Eric Multi-residues analysis of pre-emergence herbicides in fluvial sediments : application to the mid-Garonne River. (2007) Journal of Environmental Monitoring, vol. 9 (n° 9). pp. 1009-1017. ISSN 1464-0325

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Official URL: http://dx.doi.org/10.1039/b708454b

Abstract

Contamination of man and ecosystems by pesticides has become a major environmental concern. Whereas many studies exist on contamination from agriculture, the effects of urban sources are usually omitted. Fluvial sediment is a complex matrix of pollutants but little is known of its recent herbicide content. This study proposes a method for a fast and reliable analysis of herbicides by employing the accelerated solvent extractor (ASE). The aim of the study is to show the impact of a major town (Toulouse) on the herbicide content in the river. In this study, three herbicide families (i.e. s-triazine, substituted ureas and anilides) were analysed in fluvial sediment fractions at 11 sampling sites along the mid-Garonne River and its tributaries. River water contamination by herbicides is minor, except for at three sites located in urban areas. Among the herbicidal families studied, urban and suburban areas are distinguished from rural areas and were found to be the most contaminated sites during the study period, a winter low-water event. The herbicide content of the coarse sediment fractions is about one third of that found in the fine fractions and usually ignored. The distribution of pesticide concentrations across the whole range of particle sizes was investigated to clarify the role of plant remains on the significant accumulation in the coarse fractions.

Item Type:Article
Additional Information:Thanks to Royal society of chemistry editor. The definitive version is available at http://www.rsc.org/Publishing/Journals/em/index.asp. The original PDF of the article can be found at Journal of environmental monitoring website : http://www.rsc.org/delivery/_ArticleLinking/ArticleLinking.cfm?JournalCode=EM&Year=2007&ManuscriptID=b708454b&Iss=9
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
French research institutions > Centre National de la Recherche Scientifique - CNRS
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Deposited By:Florence Amor

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