| Autor: |
Baudrimont, M., Schäfer, J., Marie, V., Maury-Brachet, R., Bossy, C., Durrieu, G., Palvadeau, A., Maneux, E., Boudou, A., Blanc, G., Baudrimont, M., Schäfer, J., Marie, V., Maury-Brachet, R., Bossy, C., Durrieu, G., Palvadeau, A., Maneux, E., Boudou, A., Blanc, G. |
| Zdroj: |
Journal de Physique IV - Proceedings; May 2003, Vol. 107 Issue: 1 p135-138, 4p |
| Abstrakt: |
A historical Cd pollution of the Lot-Garonne River system (France) bas led to the contamination of sediment and water of the Gironde Estuary. In spite of the decrease of fluvial Cd inputs since the early 90ies, Cd concentrations in the Gironde oysters remain higher than European norms (5 μg.g-1dry mass) and the “zone D” classification of the estuary prohibits bivalve production and harvesting for human consumption. A geochemical survey in salt marshes used for aquaculture (crustaceans) has been conducted in order to assess the heavy métal contamination level in these systems periodically alimented by the Gironde water, accompanied by caging experiments on three bivalve species of economical interest: oysters (Crassostrea gigas), cockles (Cerastoderma edule) and clams (Ruditapes philippinarum) to study heavy metal accumulation in these organisms. Distribution of heavy metals in this system is controlled by biogeochemical processes and is independent of routine water management. Contamination levels in the studied species indicate the high accumulation of Cd by oysters. On the other hand, Cd concentrations in benthic species, such as cockles and clams, are clearly lower than European safety limits for human consumption. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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