変異原性およびTHM生成能を指標にした淀川水系の水質環境評価

概要

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The level of pollution of the Yodo River system was examined with environmental water qualities, mutagenicity and trihalomethanes formed by chlorination of river waters and sewage effluent along the river. Mutagenic formation potential (MFP) of the extracts from chlorinated waters was measured by Ames test using S. typhimurium TA100 strain without metabolic activation. The trihalomethanes (THM) such as chloroform, bromodichloromethane, dibromochloromethane and bromoform were also analyzed for THM formation potentials (THMFP) in the same water samples. In the Yodo River system, MFP and THMFP increased at the downstream of the Uji and Katsura Rivers, while around the upper stream of the Kizu River. As to the contributions of the pollution loads in MFP and THMFP from the Kizu, Uji and Katsura Rivers to the Yodo River, the rates of the MFP were 8.6%, 59.1% and 32.3%, and the THMFP were 19.5%, 54.5% and 26.0%, respectively. The contributions of the sewage effluent to the Katsura River were 38% in MFP and 36% in THMFP. These results indicated that river waters along the Yodo River were contaminated with high levels organic compounds, as precursors of genotoxicity and carcinogenicity formed by chlorination.
社団法人　日本水環境学会の論文
2001-03-10