Euglena 운동성 측정장치를 이용한 생태독성평가
Ecotoxicity Test Using E. agilis Biomonitoring System
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초록
Euglena agilis의 운동성 반응을 자동으로 측정하는 장치 인 E. agilis 시스템 (E-Tox)을 이용하여 8종의 중금속 (Ag, Cd, Cr(VI), Cu, Hg, Ni, Pb, Zn)에 대한 독성시험을 실시하 였다. E. agilis 운동성 시험 (biomonitoring test)으로부터 도 출된 EC50과 문헌상의 자료 조사로 얻은 기존 생태독성 시 험 생물 종들(D. magna, V. fischeri, 그리고 E. gracilis)의 EC50을 비교하여 시험물질에 대한 E. agilis의 독성 민감도 를 평가하였다. 또한 축산폐수 방류수, 도금폐수 방류수, 도 금폐수 1차 처리 시료에 대해 D. magna 급성 독성시험과 E. agilis 운동성 반응 시험을 수행 후 TU를 비교하여 E. agilis 운동성 시험의 현장 적용 가능성을 평가하였다. E. agilis는 시험 중금속에 대해 D. magna보다 독성민감도가 전반적으 로 낮았으나 V. fischeri 또는 E. gracilis와 유사하거나 좀 더 민감하였다. E. agilis는 D. magna test로 유독성으로 판명된 도금폐수 1차 처리수에 대해 신속한 독성반응을 나타내었 다. E-Tox 시스템은 기존의 생태독성시험장비에 비해 빠르 고 작동이 간편한 자동화 기기라는 장점이 있다. 본 연구의 결과 E-Tox 시스템을 이용한 E. agilis 운동성 시험은 향후 독성폐수에 대한 조기경보를 위한 생태독성시험법으로 적용 될 수 있을 것으로 판단된다.
Abstract
The toxic responses of flagellate Euglena agilis Carter to 8 heavy metals (Ag, Cd, Cr (VI), Cu, Hg, Ni, Pb, Zn) were measured using E. agilis system (E-Tox), an automated biomonitoring system. The E-Tox measures cell movement parameters, such as velocity, motility, and forms of the cells, as biological endpoints. EC50 values from the E. agilis biomonitoring test were compared with the literature data from the tests with Daphnia magna, Vibrio fischeri and Euglena gracilis. Measurement of the E. agilis movement behavior and D. magna acute toxicity test were also conducted for the wastewater samples. E. agilis is less sensitive than D. magna but is comparable to or more sensitive than V. fischeri and E. gracilis for the heavy metals tested in this study. E. agilis shows prompt changes of these parameters for the toxic metal plating wastewater. Major advantages of the E-tox are automatic, easy to handle and fast ecotoxicity monitoring system compared to other biological test systems. These results imply that E. agilis biomonitoring test using E-Tox can be a putative ecotoxicity test as a good early warning tool for the monitoring of toxic wastewater.
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