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Measuring Rates of Herbicide Metabolism in Dicot Weeds with an Excised Leaf Assay
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Published on: September 7, 2015

Herbicide accumulation and evolution in reservoir sediments.

Damien A Devault1, Magali Gérino, Christophe Laplanche

  • 1Laboratoire d'Ecologie fonctionnelle ECOLAB UMR 5245 CNRS-UPS-INPT, Ecole Nationale Supérieure Agronomique de Toulouse, Institut National Polytechnique, Avenue de l'Agrobiopole, 31326 Castanet-Tolosan Cedex, France. damien.devault@ensat.fr

The Science of the Total Environment
|February 4, 2009
PubMed
Summary

Reservoir configuration significantly impacts pesticide fate. While Carbonne reservoir conserves herbicides in sediment, Golfech reservoir promotes their degradation due to its unique hydromorphological position.

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Area of Science:

  • Environmental Chemistry
  • Hydrology
  • Ecotoxicology

Background:

  • Reservoirs can accumulate contaminated sediments, affecting pesticide fate.
  • Understanding sediment pesticide dynamics is crucial for water resource management.
  • Herbicide contamination is a concern in agricultural and urban river systems.

Purpose of the Study:

  • To investigate the influence of reservoir configurations on pesticide fate in sediments.
  • To compare herbicide behavior in two distinct French reservoirs: Carbonne and Golfech.
  • To analyze the relationship between sediment properties, water parameters, and pesticide persistence.

Main Methods:

  • Analysis of pesticide concentrations and C/N ratios in fine sediment (<2 mm).
  • Measurement of water oxygenation levels and herbicide concentrations.
  • Evaluation of sediment dynamic behavior within the reservoirs.
  • Comparison of in vitro remanence data with in situ observations.

Main Results:

  • Conflicting results were observed between theoretical pesticide persistence and actual sediment behavior.
  • Carbonne reservoir showed evidence of herbicide conservation and accumulation in sediments.
  • Golfech reservoir exhibited dominant pesticide transformation processes, likely due to its location.
  • The hydromorphological position of Golfech, at the confluence of rivers with different regimes and oxygen levels, accelerated pesticide breakdown.

Conclusions:

  • Reservoir configuration is a key factor controlling pesticide fate, influencing conservation versus degradation.
  • The specific conditions at Golfech reservoir facilitate rapid pesticide transformation, but this configuration is uncommon.
  • Sediment pesticide fate is complex and influenced by both intrinsic sediment properties and external hydrological factors.