Physicochemical factors affecting the sensitivity of Ceriodaphnia dubia to copper

S. D. Kim, Man Bock Gu, H. E. Allen, D. K. Cha

Research output: Contribution to journalArticle

13 Citations (Scopus)

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 zero to 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 the toxic effect of copper. This significant decrease in the toxicity of copper in the presence of natural organic materials can 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 between solubilized copper and water-borne organics.

Original languageEnglish
Pages (from-to)105-116
Number of pages12
JournalEnvironmental Monitoring and Assessment
Volume70
Issue number1-2
DOIs
Publication statusPublished - 2001 Aug 8
Externally publishedYes

Fingerprint

Copper
copper
Poisons
Water hardness
Bioassay
Hardness
Biological Assay
Water
bioassay
Flow rate
Humic Substances
neonate
Hydrodynamics
Complexation
complexation
dissolved organic matter
Biological materials
humic acid
Toxicity
hydrodynamics

Keywords

  • Complexation
  • Copper
  • Natural organic substances
  • Reaction time
  • Toxicity

ASJC Scopus subject areas

  • Environmental Science(all)
  • Environmental Chemistry

Cite this

Physicochemical factors affecting the sensitivity of Ceriodaphnia dubia to copper. / Kim, S. D.; Gu, Man Bock; Allen, H. E.; Cha, D. K.

In: Environmental Monitoring and Assessment, Vol. 70, No. 1-2, 08.08.2001, p. 105-116.

Research output: Contribution to journalArticle

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