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Evaluation of Daphniamagna for the Ecotoxicity Assessment of Alkali Leachate from Concrete

  • Choi, Jae Bang (Department of Agricultural Biology, Chungbuk National University) ;
  • Bae, Sung Min (Department of Agricultural Biology, Chungbuk National University) ;
  • Shin, Tae Young (Department of Agricultural Biology, Chungbuk National University) ;
  • Ahn, Ki Yong (Department of Civil & Environmental Engineering, Hanyang University) ;
  • Woo, Soo Dong (Department of Agricultural Biology, Chungbuk National University)
  • Received : 2013.02.12
  • Accepted : 2013.02.27
  • Published : 2013.03.31

Abstract

The cladoceran Daphniamagna has been used as an aquatic test species in aquatic toxicology. To evaluate the aquatic toxicity of leachate from concrete, the immobilization of D. magna was observed after treatment of various concentrations of leachate specimens. Reliabilities of the culture condition and the experimental protocol for acute toxicity test were successfully achieved from the standard toxicity test. The leachates were prepared from the mixture of Ordinary Portland Cement (OPC) and pozzolanic admixtures, Pulverised fuel ash (PFA), Ground granulated blast furnace slag (GGBS) and GGBS containing loess. Acute toxicity test showed 100% immobilization of D. magna for OPC or PFA. The leachates from OPC or PFA had high pH 10 to 12. However, GGBS and GGBS containing loess showed less toxicity according to the concentrations. Especially, immobilization was not observed at the concentrations below 12.5% of GGBS containing loess. Also the range of pH for these specimens was 8 to 9. This suggested that the use of loess as the admixture in concrete may be useful to reduce eco-toxicity of leachates from concrete. This our study provided the harmfulness of the alkali leaching from concrete in aquatic environment and the usefulness of D. magna to evaluate the toxicity of leachates from concrete.

Keywords

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