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Copper bioavailability in Steilacoom Lake sediments

D B Huggett1, W B Gillespie, J H Rodgers

  • 1Department of Biology, University of Mississippi, University, Mississippi 38677, USA.

Archives of Environmental Contamination and Toxicology
|January 15, 1999
PubMed
Summary
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Copper sulfate in Steilacoom Lake sediments impacted Ceriodaphnia dubia more than other tested organisms. Sediment AVS and interstitial water concentrations did not accurately predict copper bioavailability.

Area of Science:

  • Environmental Chemistry
  • Aquatic Toxicology
  • Ecotoxicology

Background:

  • Copper sulfate was added to Steilacoom Lake sediments to determine copper bioavailability.
  • Hyalella azteca, Chironomus tentans, and Ceriodaphnia dubia were used to assess toxicity.

Purpose of the Study:

  • To evaluate copper bioavailability in Steilacoom Lake sediments.
  • To determine the sensitivity of different aquatic organisms to copper exposure.
  • To assess the predictive power of sediment AVS and interstitial water concentrations for copper toxicity.

Main Methods:

  • Sediments were amended with varying concentrations of copper sulfate.
  • Survival and growth of H. azteca, C. tentans, and C. dubia were monitored.
  • Sediment AVS, SEM, and interstitial water copper concentrations were analyzed.

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Main Results:

  • H. azteca and C. tentans showed no significant effects up to 2,010 mg Cu/kg.
  • C. dubia exhibited sensitivity, with 10-day NOEC and LOEC values of 906 and 1,469 mg Cu/kg for survival and reproduction.
  • Sediment AVS and interstitial water concentrations were poor predictors of copper bioavailability.

Conclusions:

  • Copper toxicity in Steilacoom Lake sediments is primarily indicated by effects on sensitive species like C. dubia.
  • Predicted effects on C. dubia may occur at bulk sediment concentrations exceeding 906 mg Cu/kg.
  • AVS and interstitial water measurements are unreliable for predicting copper bioavailability in this environment.