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| Comparison of the biotoxicity of organic compounds in source and tap water from the Yangtze and Han River |
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Abstract The nonvolatile organic compounds (NVOCs) in samples of the source water and tap water from the Yangtze and Han River in Wuhan were absorbed by XAD-2 resin and eluted sequentially with dichloromethane followed by acetone. After evaporation to dryness, the mutagenic and estrogenic activity of the extracts were detected and compared by Ames test and YES. The results showed in normal flow period in 2008, the NVOCs of finished water of Yangtze River was negative to TA98 with S9. The other water samples were positive whether with or without S9. In high flow period, each water sample were positive to TA98 with or without S9 except the source water of Yangtze River. In low flow period, only the finished water and the terminal tap water of Yangtze River were positive to TA98 without S9. Each water sample from different hydroperiods was negative to TA100 with or without S9. Both the NVOCs in source water of the Yangtze River and the Han River showed the estrogenic activity in normal flow period and the estrogenic activity of Yangtze River was higher than Han River. No water sample showed estrogenic activity in high flow period while in low flow period only source water of Yangtze River presented the estrogenic activity. The mutagenicity of the tap water was higher than that of source water in Yangtze and Han River. The Ames results showed that the mutagenicity of Han River was higher than that of Yangtze River and the NVOCs mainly contained frameshift mutagens. The estrogenic activity of NVOCs was only found in some source water and it became negative after treated by the routine process of water works.
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Received: 14 July 2009
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