Genotoxicity of Organic Extracts from Product Water of Water Plants and the Influencing Factors

Objective To study the genotoxicity of the organic extracts from the product water of water plants and the affection of water source,disinfectant type,prechlorination and bioactive carbon filtration on the genotoxicity. Methods Ames test was used to test the mutagenicity of water samples from six water plants from May to June, 2008. Results All of the product water samples of six water works (A,B,C,D,E,F) showed positive results in Ames test. The mutagenicity showed as follows: TA98(-S9): EDCAFB; TA98(+S9): ECFD( A, B were negative); TA100(-S9): EFCA(D、B were negative); As for TA100(+S9), only E was positive. Conclusion The mutagenicity of product water of six water works is relatively high,the type of mutagenicity is mainly code-shifting. Taking river water as the water source,using chlorine dioxide and active carbon filtration and no using pretreatment of chlorination may reduce the mutagenic organics.