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The micronucleus(MCN) test of Vicia faba root tip cell was used to screen the water quality of the Taihu Lake. The MCN ‰ and the pollution index ( PI ) were examined and the F-test was carried out to evaluate the statistical difference in mean MCN ‰ among various samples. There were significant difference among thirty nine samples and there were six sites whose PI values are above 2. The authors suggest that the Taihu Lake has partly been polluted to different degrees and the whole water body can be divided into three types. Ames tests were then conducted to detect mutagenicity at five significant sites. The results showed that rivers flowing through urban area carried large amount of mutagenic pollutants into the lake and these pollutants contaminated the source of main waterworks.
