Refining uptake and depuration constants for fluoroalkyl chemicals in Chironomus riparius larvae on the basis of experimental results and modelling

Amélioration des constantes d'absorption et d'élimination de substances fluoroalkylées chez des larves de Chironomus riparius à partir de résultats expérimentaux et de modélisation

Bertin, D. ; Ferrari, B.J.D. ; Labadie, P. ; Sapin, A. ; Da Silva Avelar, D. ; Beaudouin, R. ; Pery, A.R.R. ; Garric, J. ; Budzinski, H. ; Babut, M.

Type de document
Article de revue scientifique à comité de lecture
Langue
Anglais
Affiliation de l'auteur
IRSTEA LYON UR RIVERLY FRA ; IRSTEA LYON UR RIVERLY FRA ; CNRS UMR 5805 EPOC UNIVERSITE DE BORDEAUX TALENCE FRA ; IRSTEA LYON UR RIVERLY FRA ; IRSTEA LYON UR RIVERLY FRA ; UNITE MODELES POUR L'ECOTOXICOLOGIE INERIS VERNEUIL EN HALATTE FRA ; AGROPARISTECH UMR 1402 INRA THIVERVAL GRIGNON FRA ; IRSTEA LYON UR RIVERLY FRA ; CNRS UMR 5805 EPOC UNIVERSITE DE BORDEAUX TALENCE FRA ; IRSTEA LYON UR RIVERLY FRA
Année
2018
Résumé / Abstract
The aims of this study were to determine depuration rates for a range of per- and polyfluoroalkyl substances (PFASs) using Chironomus riparius, and to test a concentration-dependency hypothesis for the long-chain perfluorotridecanoic acid (PFTrDA) for this species. Midge larvae were exposed to field sediments collected downstream of a fluorotelomer plant, and to the same sediment spiked with PFTrDA. Elimination kinetics results indicated complete elimination of all PFASs by chironomids after 42 h. These data were used to develop two PFTrDA bioaccumulation models accounting for chironomid growth and for compound concentration dependency or not. There was much better agreement between observed and simulated data under the concentration-dependency hypothesis than under the alternative one (passive diffusion). The PFTrDA uptake rate derived from the concentration-dependency model equaled 0.013±0.008 goc gww h
Source
Ecotoxicology and Environmental Safety, vol. 149, p. 284 - 290

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