上海市供水系统微囊藻毒素LR含量调查

目的　调查上海市供水系统中微囊藻毒素LR(MC- LR)的污染状况及常规水处理工艺对MC- LR的去除效果。方法　运用高效液相色谱法 (HPLC)检测有代表性的水源、水厂及出厂水样中MC LR的含量。结果　源水中MC- LR浓度随采样点及采样季节变化 ,在夏末秋初易形成污染高峰 ,最高达 2 . 38μg L。混凝沉淀、加氯消毒对去除毒素有一定的效果 ,而过滤则效果不明显 ,在出厂水中也能检测到MC- LR ,最高达1. 2 7μg L。结论　夏秋季节上海市供水系统源水受到以MC- LR为代表的蓝藻毒素的污染 ,郊区源水污染较重 ,常规水处理工艺不能有效地去除水中的微囊藻毒素。

Survey on the contamination of microcystin-LR in water supply of Shanghai city

OBJECTIVE: To study the pollution level of microcystin-LR in water supply of Shanghai city and the removal efficacy for microcystin-LR through routine water treatment technique. METHODS: High performance liquid chromatogram (HPLC) was applied to determine the concentration of microcystin-LR in source water, water samples after various water treatment procedures and tap water. RESULTS: The concentration of microcystin-LR varied with sampling seasons and sites and reached peak during summer and fall. The maximum of microcystin-LR was 2.38 microg/L in source water. Coagulation plus chlorine disinfection were found to be effective for the removal of microcystin-LR, while the remove rate through filtration was not significant. And it could also be detected in tap water as high as 1.27 microg/L. CONCLUSION: The source waters of Shanghai city were polluted by cyanobacteria toxins represented by microcystin-LR. The source water in suburb was more polluted. Routine water treatment techniques can not remove the toxins effectively.