Role of the hyporheic heterotrophic biofilm on transformation and toxicity of pesticides

Role des biofilms hyporhéiques hétérotrophes sur la transformation et la toxicité des pesticides

Sanchez Perez, J.M. ; Montuelle, B. ; Mouchet, F. ; Gauthier, L. ; Julien, F. ; Sauvage, S. ; Teissier, S. ; Dedieu, K. ; Destrieux, D. ; Vervier, P. ; Gerino, M.

Type de document
Article de revue scientifique à comité de lecture
Langue
Anglais
Affiliation de l'auteur
CNRS UNIVERSITE DE TOULOUSE III INPT UMR 5245 ECOLAB FRA ; IRSTEA LYON UR MALY FRA ; CNRS UNIVERSITE DE TOULOUSE III INPT UMR 5245 ECOLAB FRA ; CNRS UNIVERSITE DE TOULOUSE III INPT UMR 5245 ECOLAB FRA ; CNRS UNIVERSITE DE TOULOUSE III INPT UMR 5245 ECOLAB FRA ; CNRS UNIVERSITE DE TOULOUSE III INPT UMR 5245 ECOLAB FRA ; CNRS UNIVERSITE DE TOULOUSE III INPT UMR 5245 ECOLAB FRA ; CNRS UNIVERSITE DE TOULOUSE III INPT UMR 5245 ECOLAB FRA ; CNRS UNIVERSITE DE TOULOUSE III INPT UMR 5245 ECOLAB FRA ; CNRS UNIVERSITE DE TOULOUSE III INPT UMR 5245 ECOLAB FRA ; CNRS UNIVERSITE DE TOULOUSE III INPT UMR 5245 ECOLAB FRA
Année
2013
Résumé / Abstract
The role of heterotrophic biofilm of water–sediment interface in detoxification processes was tested in abiotic and biotic conditions under laboratory conditions. Three toxicants, a herbicide (Diuron), a fungicide (Dimethomorph) and an insecticide (Chlorpyrifos-ethyl) have been tested in water percolating into columns reproducing hyporheic sediment. The detoxification processes were tested by comparing the water quality after 18 days of percolation with and without heterotrophic biofilm. Tested concentrations were 30 mg.Lx1 of Diuron diluted in 0.1% dimethyl sulfoxide (DMSO), 2 mg.Lx1 of Dimethomorph and 0.1 mg.Lx1 of Chlorpyrifos-ethyl. To characterise the detoxification efficiency of the system, we performed genotoxicity bioassays in amphibian larvae and rotifers and measured the respiration and denitrification of sediments. Although the presence of biofilm increased the production of N-(3,4 dichlorophenyl)-N-(methyl)- urea, a metabolite of diuron, the toxicity did not decrease irrespective of the bioassay. In the presence of biofilm, Dimethomorph concentrations decreased compared with abiotic conditions, from 2 mg.Lx1 to 0.4 mg.Lx1 after 18 days of percolation. For both Dimethomorph and Chlorpyrifos-ethyl additions, assessment of detoxification level by the biofilm depended on the test used: detoxification effect was found with amphibian larvae bioassay and no detoxification was observed with the rotifer test. Heterotrophic biofilm exerts a major influence in the biochemical transformation of contaminants such as pesticides, suggesting that the interface between running water and sediment plays a role in self-purification of stream reaches.
Source
Annales de Limnologie-International Journal of Limnology, vol. 49, num. 2, p. 87 - 95

puce  Accés à la notice sur le site Irstea Publications / Display bibliographic record on Irstea Publications website

  Texte intégral / Full text

  Liste complète des notices de CemOA