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• W2008560986 abstract "The extent to which ingested suspended sediment can be a source of mercury for suspension feeders is largely unknown, yet this information is required to evaluate the biological significance of sediment contamination. We used radiotracer methodology to experimentally compare the bioavailability of dissolved and sediment-bound mercury for a marine bivalve. We examined the relative importance of specific sedimentary components that may exert control on the uptake of Hg(II) and CH3Hg(II) from sediments in the mussel Mytilus edulis, which is widely used in national monitoring programs as a bioindicator organism for detect ing coastal contamination. Iron and manganese oxides, montmorillonite clay, and silica, with and without organic coatings, as well as natural sediment particles were radiolabeled with either 203Hg(II) or CH3203Hg using nanomolar levels of Hg. Fulvic acid coatings enhanced the sorption of both Hg(II) and CH3Hg(II) onto every type of particle, and partition coefficients were as high as 105. The assimilation efficiencies (AE) in mussels were very low for Hg(II) (1−9%) but were typically >30% for CH3Hg(II) and as high as 87%. The organic coatings increased AE for CH3Hg(II) bound to all types of particles, but had no impact on Hg(II). Unlike Cd, Co, and Ag, there was little (<10%) desorption of 203Hg from particles at pH 5 (to simulate the behavior of food-bound metals in the acidic gut of bivalves), and it did not influence Hg assimilation in mussels. The absorption of CH3Hg(II) by mussels is rapid and efficient even from uncoated inorganic particles that were rapidly egested out of the animal's gut due to their low nutritional value. The concentration factor (103) of dissolved Hg(II) in mus sels was half that of dissolved CH3Hg(II). These results suggest that contaminated sediments can be a significant source of Hg, especially organic mercury, to marine suspension feeders and that CH3Hg(II) is assimilable from all major sedimentary components." @default.
• W2008560986 created "2016-06-24" @default.
• W2008560986 creator A5027816815 @default.
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• W2008560986 date "1997-03-27" @default.
• W2008560986 modified "2023-10-13" @default.
• W2008560986 title "Bioavailability of Sediment-Bound Methyl and Inorganic Mercury to a Marine Bivalve" @default.
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• W2008560986 doi "https://doi.org/10.1021/es960364k" @default.
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