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1J - Bioaccumulation (WEP/52) Contamination of aquatic organisms of the Gironde estuary (fishes, molluscs, crustaceans) by Polychlorobiphenyls (PCBs). BUDZINSKI, HELENE1, TAPIE, NATHALIE1, GOURSOLLE, RICHARD1, 1 UNIVERSITY BORDEAUX I, TALENCE, 33, FRANCE ABSTRACT- Due to their toxic properties and to the recent re-evaluation of them the study of environmental distribution of Polychlorobiphenyls (PCB) has regained a great interest. Monitoring programs of the marine environment exist: The Mussel Watch (Farrington et al., 1983) or the National Network for the Observation (Reseau National d'Observation (RNO) (Claisse, 1992)) have been developed in order to follow the quality of coastal sea waters. Models have been developed in order to simulate and understand the bioaccumulation of hydrophobic organic compounds by organisms. Nevertheless due to the complexity of phenomena that govern the absorption, the accumulation of xenobiotics by organisms, it is necessary to gain a better knowledge on the bioavailability and on the fate of these contaminants in the organisms. The work presented here deals with the determination of PCBs in fishes, molluscs and crustaceans in the Gironde estuary. More than 300 individuals have been analysed for two different seasons. The relation between the contamination and the trophic level has been studied. The implication of the dissolved phase, the particulate one and the planctonic compartment have been also taken into account in order to explain the observed PCB concentrations. Key words: ESTUARY, PCB, TROPHIC CHAIN |
