Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Toxic Effects of Metal Plating Wastewater on Daphnia magna and Euglena agilis

Daphnia magna와 Euglena agilis를 이용한 도금폐수 독성평가

  • Lee, Junga (Department of Environmental Energy Engineering, Kyonggi University) ;
  • Park, Da Kyung (Department of Environmental Energy Engineering, Kyonggi University)
  • 이정아 (경기대학교 환경에너지공학과) ;
  • 박다경 (경기대학교 환경에너지공학과)
  • Received : 2016.05.10
  • Accepted : 2016.06.23
  • Published : 2016.06.30
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Abstract

The ecotoxicity tests for metal plating wastewater were conducted using Daphnia magna (D. magna) and Euglena agilis (E. agilis). Evaluation for sources of toxicity was performed by 1) Correlation analysis between the concentration of individual metals in the metal plating wastewater and the toxic effects on D. magna, 2) Toxicant identification evaluation methods including graduated pH method, EDTA procedure and sodium thiosulfate procedure, 3) Comparison of toxic effect value ($EC_{50}$ or $LC_{50}$) of individual metal on D. magna and it's concentration in the metal plating wastewater. To evaluate the possibility of E. agilis, a Korean domestic organism, as a test model organism for metal plating waste water, E. agilis toxicity test was also assessed using on-line euglena ecotoxicity system (E-Tox system). Based on toxicant characterization test using D. magna, it was expected that SS, oxidants and heavy metals are responsible for toxicity of metal plating waste water. Especially Cu, Hg, and Ag were the major cationic metals that caused toxicity. E. agilis is less sensitive than D. magna based on the $EC_{50}$ value however it shows prompt response to toxic test substances. E. agilis shows even a significant effect on the cell swimming velocity within 2 min to toxic metal plating wastewater. Our study demonstrates that E. agilis test can be a putative ecotoxicity test for assessing the quality of metal plating waste water.

본 연구에서는 경기도 안산 도금폐수 처리시설에서 총 4개 시료를 대상으로 국내 생태독성시험 표준 생물 종인 D. magna와 국내서식 종 E. agilis를 이용한 생태독성을 수행하였다. 시료에 대한 독성원인물질 탐색은 D. magna 급성 독성시험법을 이용하여 1) 시료 내 개별 중금속 농도와 시료의 독성영향과의 상관분석, 2) 원인물질탐색 실험 (단계적 pH, SS, 중금속, 산화제 Test), 3) 중금속 목적물질에 대한 독성영향 농도와 시료 내 목적물질의 농도와의 비교 등을 통해 평가하였다. 도금폐수 시료에 대한 E. agilis 시험법의 적용 가능성 평가는 E. agilis 실시간 생태독성 모니터링장비(E-Tox 시스템)를 이용하여 수행하였다. D. magna 시험 결과, 시료의 독성원인물질군은 부유물질 (SS), 산화제 그리고 중금속으로 예측되었으며 개별 중금속 원인물질은 Cu, Hg, Ag로 판단되었다. E. agilis는 D. magna에 비해 독성 민감도는 높지 않으나 D. magna에 독성영향을 나타내는 도금폐수시료에 신속하고 민감하게 반응하였다. 본 연구의 결과 D. magna를 이용한 단계별 독성원인물질 탐색평가과정은 생태독성기준을 초과하는 도금폐수 시료에 대한 독성 원인물질을 파악하는데 효과적으로 나타났다. 또한 E-agilis 시험은 향후 도금폐수의 수질을 실시간으로 모니터링 하는데 적용 가능 할 것으로 판단된다.

Keywords

References

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