Cadmium bioavailability to three estuarine animals in relation to geochemical fractions to sediments |
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| Authors: | Joseph H. Rule Raymond W. Alden III |
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| Affiliation: | (1) Department of Geological Sciences, Old Dominion University, 23529 Norfolk, Virginia, USA;(2) Applied Marine Research Laboratory, College of Sciences, Old Dominion University, 23529 Norfolk, Virginia, USA |
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| Abstract: | The effects of sediment characteristics and geochemical fractions on the biological availability of cadmium to estuarine animals were studied. Grass shrimp (Palaemonetes pugio), blue mussels (Mytilus edulis) and a polychaete (Nereis virens) were exposed to Cd-treated sediment for 14 days. The test populations were evaluated for mortalities, oxygen consumption (exceptN. virens), and bioaccumulation of Cd. Sediment Cd was extracted sequentially to determine the exchangeable (EP), easily reducible (ERP), organic-sulfide (OSP), moderately reducible (MRP), and acid extractable (AEP) geochemical phases.The shrimp displayed significant respiration effects; the shrimp and mussels bioaccumulated Cd, particularly in the Cd-sand treatments. The polychaete did not bioaccumulate Cd. The OSP contained the greatest concentrations of Cd in all treatments. The Cd-sands were characterized by relatively higher levels of EP and ERP than for silts or clays. A statistical model was developed that describes the bioaccumulation of Cd as a function of EP and ERP geochemical fractions of sediment Cd forM. edulis. |
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