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초록

The purpose of this study conducted in 2017 was to evaluate the water quality of
the Han River by conducting the acute toxicity tests with Daphnia magna at the public
sewage treatment facilities in Seoul and at points in the Han River where waste water
entered. In addition, we analyzed the physico-chemical parameters and tested for heavy
metals in the water. Ecotoxicity tests with Daphnia magna were conducted on samples
from the influent at the public sewage treatment facilities and the results showed an
average toxicity unit(TU) of 1.6 and a maximum TU of 5.7. However, ecotoxicity tests
of the effluent, which is discharged to the Han River after treatment, showed a TU of
0.0. Acute toxicity tests of 76 samples at five sites corresponding to 2~4 sections of
the Han River recreational water body only showed a TU of 0.5 in the sample from
the Seongsu Bridge collected on 10th October. There was a limit to the interpretation
of the cause of toxicity. Except in one case, most of