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(70-33) Bioaccumulation of Sediment Bound Metals and Toxicity Evaluation Using the Clam Macoma nasuta . Lu, Xiaoqiao1, Inge, Werner*,2, Ozlem, Tuli1, Young, Tom1, 1 Department of Civil & Environmental Engineering, University of California, Davis, California2 Department of Anatomy, Physiology and Cell Biology, School of Veterinary Medicine, University of California, Davis, California ABSTRACT- In this study, bioaccumulation of sediment associated metals and mortality were measured using the clam Macoma nasuta. Clams were exposed to sediment samples collected from six different locations in Northern San Francisco Bay (San Pablo Bay) as part of a comprehensive ecological risk assessment performed in our laboratories. Sediments from some sites were observed to be toxic. Concentrations of potentially toxic metals (e.g., Cr, As, Hg, Cu, Ni, Pb, Cd and Ag) were analyzed using Inductively Coupled Plasma-Mass Spectrometry (ICP/MS) in clam tissue and in the fine-grained fraction (< 63-mm) of the sediments using 0.5 M HNO3 acid as a leaching reagent. Primary results showed that metal concentrations in sediments were significantly elevated overall. Metal accumulation by the clam varied according to sediment metal concentration, metal toxicity and metal bioavailability. Key words: San Pablo Bay sediment, , Clam tissue, Metals, Toxicity |
