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Communication Dans Un Congrès Année : 2008

Pesticide transfer dynamics and fluxes in the stream of a small vineyard watershed. Assessing the effect of sampling strategy on fluxes estimation

Résumé

This study reports on the occurrence and behaviour of eight pesticides and metabolites in a small stream draining a vineyard watershed in the Beaujolais area (France). Punctual and automatic sampling strategies were achieved along the river during one hydrological year in order to assess the spatial and temporal variability of pesticide concentrations and loads in the river. Flood events were also monitored in order to evaluate the role of hydrological conditions on pesticide mobilisation. Results show the strong temporal and spatial variability of pesticide concentrations in the river in relation with the periods of pesticide application. A large mobilisation of pesticides was observed during floods (representing more than 80% of the total pesticide load in August 2007); these results highlight the major role of floods in the transport of pesticides. The evaluation of pesticide loads using different sampling strategies (i.e., weekly and monthly punctual; automatic sampling for floods and for weekly composite sampling) and methods of calculation, showed that punctual sampling largely underestimates pesticides fluxes transiting through the river whereas the weekly composite sampling appears as more representative.
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Dates et versions

hal-00615441 , version 1 (19-08-2011)

Identifiants

Citer

M. Rabiet, C. Margoum, V. Gouy, N. Caluer, Marina Coquery. Pesticide transfer dynamics and fluxes in the stream of a small vineyard watershed. Assessing the effect of sampling strategy on fluxes estimation. 5th European Conference on Pesticides and Related Organic Micropollutants in the Environment, Oct 2008, Marseille, France. 4 p. ⟨hal-00615441⟩

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