Mise en évidence du potentiel bioaccumulateur des bryophytes aquatiques vis-a-vis des PCB et des pesticides organochlores : étude in situ et en laboratoire proposition de grilles d'évaluation de la contamination par les organochlorés

Abstract : Organochlorine pollution of french rivers (Seine, Isère, Rhône) is studied with autochthonus and implanted aquatic bryophytes. Analysis of PCB, lindane and isomers, HCB, DDT and its metabolites in mosses allows to localise different degrees of pollution in effluents. Implantation on particulary contaminated sites has shown a good resistance of mosses to a multiform pollution : 289 ppm of PCB in mosses implanted in a industrial effluent, 67 ppm of DDT and metabolites in bryophytes in Drac river close to Grenoble. Transfert during 6 days seems to be sufficient to obtain a good analogy between micropollutant concentrations in autochthonous and implanted mosses. Half of equilibrium concentrations is reached in 24 hours. Accumulation and depuration kinetics of PCB by aquatic bryophytes were studied in situ and in laboratory. Accumulation is rapid and the steady state is reached after 10 days of accumulation. Depuration is slow : in 17 days of depuration, bryophytes had eliminated only 47% of initial PCB concentrations. Interspecific differences don't exeed twice factor. Quality indexes based on organochlorine pollution of bryophytes are proposed
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Brigitte Gallissot. Mise en évidence du potentiel bioaccumulateur des bryophytes aquatiques vis-a-vis des PCB et des pesticides organochlores : étude in situ et en laboratoire proposition de grilles d'évaluation de la contamination par les organochlorés. Ecotoxicologie. Université Paul Verlaine - Metz, 1988. Français. ⟨NNT : 1988METZ013S⟩. ⟨tel-01775567⟩

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