Mutagenicity and Background Content Chemicals of Water Quality of Source Water and Tap Water in Kunming Ⅰ.Ames test and chemical background value of inorganic and organic micro-pollutants in source water of and tap water

Concentrated extracts from tap water and their source water from Dianchi Lake and Songhuaba Reservoir were prepared through adsoption onto XAD-2 resin and tested for their mutagenicity with Ames Salmonella His+ reversion system.The results are as follows:The extract of chlorinated tap water from Dianchi Lake source water showed mutagenic activity towards TA98 with or without S9 mix.The results are positive.The mutagenicity of extract of source water from Dianchi Lake is ambiguous.If taking upper confidetial limit for evaluation,it is positive.The other groups were negative in comparison with the control group.The bioassays were paralleled with chemical analysis,which were used in survey of chemical micro-pollutants in tap water and their sources.These results are concerned with the effects of genetoxicity of micro-pollutants in water on public health.