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Physicochemical Factors Affecting the Sensitivity of Ceriodaphnia dubia to Copper

Environmental Monitoring and Assessment volume 70, pages 105–116 (2001)Cite this article

Abstract

The effects of physicochemical conditions, such as pH, water hardness, flow rates and natural organic substances on the sensitivity of Ceriodaphnia dubia to the toxic effects of copper were investigated using static bioassay cups and specially designed flow-through bioassay chambers. We found that C.dubia was very sensitive to pH changes and the total copper LC50 values of C. dubia neonates increased by 15-fold as the pH increased from pH 7 to 10. It was also observed that the LC50 values increased sharply upon increasing the water hardness value to 2.4 meq. In addition, increasing flow rates from zeroto 50 mL hr-1 also increased its sensitivity to copper, which was possibly due to hydrodynamic stress.The presence of natural organic substances (humic acid and dissolved organic matter) and suspended particles decreased thetoxic effect of copper. This significant decrease in the toxicity of copper in the presence of natural organic materialscan be explained by a reduction in the free ion concentration due to complexation. Furthermore, we observed that the kinetics of copper interactions with natural organic materials are a significant factor in the toxic effect of copper and that the acute LC50 values increased with increasing reaction time betweensolubilized copper and water-borne organics.

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Authors and Affiliations

  1. Department of Environmental Engineering and Science, Kwangju Institute of Science and Technology, 1 Oryong-dong Puk-gu, Kwangju, 500-712, Korea

    Sang Don Kim

  2. Department of Environmental Engineering and Science, Kwangju Institute of Science and Technology, 1 Oryong-dong Puk-gu, Kwangju, 500-712, Korea

    Man Bock Gu

  3. Department of Civil and Environmental Engineering, University of Delaware, U.S.A.

    Herbert E. Allen & Daniel K. Cha

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  1. Sang Don Kim
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  2. Man Bock Gu
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  3. Herbert E. Allen
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  4. Daniel K. Cha
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Correspondence to Sang Don Kim.

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Kim, S.D., Gu, M.B., Allen, H.E. et al. Physicochemical Factors Affecting the Sensitivity of Ceriodaphnia dubia to Copper. Environ Monit Assess 70, 105–116 (2001). https://doi.org/10.1023/A:1010689432130

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  • DOI: https://doi.org/10.1023/A:1010689432130

  • complexation
  • copper
  • natural organic substances
  • reaction time
  • toxicity