AVS regulation of cadmium bioavailability in a life-cycle sediment toxicity test using Leptocheirus plumulosus
Conference
·
OSTI ID:211904
- Battelle Marine Sciences Lab., Sequim, WA (United States)
- Environmental Protection Agency, Newport, OR (United States). Environmental Research Lab.
- Environmental Protection Agency, Narragansett, RI (United States). Environmental Research Lab.
Numerous studies have shown the utility of interstitial water concentrations of metals and simultaneously extracted metals:acid volatile sulfide ratios (SEM:AVS) in explaining the acute toxicity of sediment-associated metals to benthic organisms, but no full life-cycle chronic tests have been conducted for this purpose. In this study, cohorts of newborn amphipods, Leptocheirus plumulosus, were exposed to cadmium-spiked estuarine sediment for 28 days to determine effects on mortality, growth, and reproduction relative to interstitial water and SEM:AVS normalizations. Seven treatments of Cd were tested: control, 0.35, 0.87, 1.32, 1.53, 2.22, and 5.10 molar SEM:AVS ratios. Overlying water, interstitial water and sediment concentrations of SEM Cd and AVS were monitored periodically and by depth during the exposure. When sediments SEM:AVS ratios were < 1.53, interstitial water concentrations of Cd were less than the 10-day water-only Cd LC50, and mortality, growth and reproduction were not affected. When SEM:AVS ratios were > 2.22, interstitial water Cd concentrations were greater than 100 times the 10-day water-only Cd LC50, and all amphipods died. These results are consistent with predictions of metal bioavailability from acute tests with metals-spiked sediments, i.e. that sediments with SEM:AVS ratios less than 1.0 and less than 0.5 interstitial water toxic units are not toxic, while sediments with SEM:AVS ratios greater than 1.0 and interstitial water toxic units (IWTUS) greater than 0.5 may be toxic.
- OSTI ID:
- 211904
- Report Number(s):
- CONF-9511137--; ISBN 1-880611-03-1
- Country of Publication:
- United States
- Language:
- English
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