Ames Mutagenicity of Tap Water III. Analysis of Mutagenicity Level of Tap Water in Japan

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  • URANO Kohei
    Laboratory of Safety and Environmental Engineering, Yokohama National University
  • OKABE Fumie
    Laboratory of Safety and Environmental Engineering, Yokohama National University
  • TAKANASHI Hirokazu
    Department of Applied Chernistry, Oita University
  • FUJIE Koichi
    Department of Ecological Engineering, Toyohashi University of Technology

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Other Title
  • 水道水のAmes変異原性に関する研究　第3報　日本の水道水の変異原性レベルの解析
  • スイドウスイ ノ Ames ヘンイゲンセイ ニカンスルケンキュウ ダイ 3ポウ

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Abstract

The Ames mutagenicity levels of tap water at 23 cities in Japan were investigated during a year for indicating the need of evaluation and control of gene toxicity of tap water. The mutagenicity values were ranged from under the detection limit to 9,200 net rev.·l-1, and their difference was about 30 times. The mutagenicity values higher than 3,000 net rev.·l-1 were about one fourth of them. There was no significant relation between the mutagenicitv of tap water and the kinds of the water treatment process or the water source except ground water. The mutagenicity values tended to be higher in winter and spring, and their annual means at each city were ranged from 290 net rev.·l-1 to 4,400 net rev.·l-1. It means that there is 15 times difference of the gene injury risk in these areas. Furthermore, the relations between the mutagenicity values and the conventional water qualities were not clear. Consequently, it was indicated that the Ames mutagenicity was available for evaluation and control of water safety in addition to the conventional water qualities. Especially, the mutagenicity of tap water should be evaluated and controlled in the area where the mutagenicity was clearly higher (above 3,000 net rev.·l-1) than the other areas.

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