The importance of dissolved organic compounds in the accumulation of copper by the american oyster,crassostrea virginica |
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| Authors: | Craig D Zamuda David A Wright Richard A Smucker |
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| Institution: | Office of Emergency and Remedial Response, United States Environmental Protection Agency, Washington, DC 20460, USA;University of Maryland, Center for Environmental and Estuarine Studies, Chesapeake Biological Laboratory, Solomons, Maryland 20688-0038, USA |
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| Abstract: | The influence of various dissolved organic compounds upon copper accumulation by the American oyster, Crassostrea virginica was examined. Oysters were exposed to a range of copper concentrations (64Cu) in the presence of filtered estuarine water (FEW), UV-photooxidized FEW and FEW amended with the additions of natural dissolved organic compounds—chitin and cellular orgaanic compounds (derived from the diatom, Thalassiosira pseudonana). Copper accumulation rates were significantly greater in the UV-treated medium and decreased with the addition of dissolved organics. When normalized on a per weight DOC basis, the reductions in copper accumulation rates were greater in the presence of chitin than cellular organic compounds. The results suggest that natural dissolved organics differ markedly with respect to their influence upon copper bioavailability. |
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