三峡工程二期蓄水过程中生活饮用水水源水质

目的 了解三峡工程二期蓄水过程中长江重庆段水质的变化情况。方法 于2003年三峡工程二期蓄水前(5月31日)、蓄水期(6月8—10日)、蓄水后(6月11-15、20、31日)在重庆7个淹没区县(万州、涪陵、丰都、忠县、云阳、奉节、巫山)的10个在长江干流上取水的区县级水厂取水点按《生活饮用水卫生规范)(2001)采样、监测并进行评价。结果 蓄水前共监测水源水11份，合格8份，合格率为72．73％；不合格3份，不合格项目是总大肠菌群(27．27％)；理化指标全部合格。蓄水期监测水源水23份，合格14份，合格率60．87％；不合格9份，不合格的项目为总大肠菌群(39．13％)。蓄水后共监测水样51份，合格9份，合格率为17．65％；不合格42份，不合格项目是总大肠菌群(82．35％)。结论 在三峡工程蓄水过程中，长江重庆段总大肠菌群合格率下降，一般化学指标与毒理学指标在蓄水过程中无异常变化。

An Analysis of Water Quality From the Yangtse River as Drinking Water Source During the Second Period Water Storing in Three Gorges Project

Objective To know the quality of drinking,water produced by water plants built along the Chongqing sector of the Yangtse River during the second period water storing period of Three Gorge Project. Methods According to the hygienic standards of drinking,water, the quality of the source water and drinking water produced by water plants in the counties lie along the river was tested. Results 8 of 11 water samples collected before water storing were up to the standards (72.73%), 14 of 23 samples collected during water storing were up to the standards (60.87%), only 9 of 51 sampled after water storing were up to the standards (17.65%). Both the chemical and toxicological indexes were up to the hygienic standards, the turbidity values and total coliform bacteria were not. Conclusion Source water has been contaminated by coliform bacteria., no remarkable changes have been seen in the chemical and toxicological indexes of source water and drinking water before and after water storing.