A Site-Specific Evaluation of Mercury Toxicity in Sediment |
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Authors: | J C Sferra P C Fuchsman R J Wenning T R Barber |
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Institution: | (1) McLaren/Hart-ChemRisk, 5900 Landerbrook Dr., Cleveland, Ohio 44124, USA , US;(2) McLaren/Hart-ChemRisk, 1135 Atlantic Ave., Alameda, California 94501, USA , US |
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Abstract: | A site-specific evaluation of mercury toxicity was conducted for sediments of the Calcasieu River estuary (Louisiana, USA).
Ten-day whole-sediment toxicity tests assessed survival and growth (dry weight) of the amphipods Hyalella azteca and Leptocheirus plumulosus under estuarine conditions (10 ppt salinity). A total of 32 sediment samples were tested for toxicity, including 14 undiluted
site sediment samples and 6 sediment dilution series. All sediment samples were analyzed for total mercury and numerous other
chemical parameters, including acid volatile sulfide (AVS) and simultaneously extracted metals (SEM). No toxicity attributable
to mercury was observed, indicating that a site-specific threshold for total mercury toxicity to amphipods exceeds 4.1 mg/kg
dry weight. Site-specific factors that may limit mercury bioavailability and toxicity include relatively high sulfide levels.
Additionally, the chemical extractability of mercury in site sediments is low, as indicated by SEM mercury analyses for three
sediment samples containing a range of total mercury concentrations.
Received: 17 November 1998/Accepted: 7 June 1999 |
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