太湖流域水中微囊藻毒素含量调查

目的 了解有毒蓝藻水华频繁暴发的太湖流域周边城市水源水和饮用水中微囊藻毒素(MC)的含量.方法 采用50ng/L检出限的酶联免疫吸附试验,于2001年7月对江苏无锡10个调查点的水样MC含量进行测定.共收集水样90份,其中以太湖水或深井水为源水的7个自来水厂的水源厂、出厂水各11份,末梢水48份,浅井水17份,河水3份.结果 太湖水来源的8份水源水中均检出高浓度MC,其范围在2699～14188ng/L之间,源水处理后仍检出微量毒素(<100ng/L);深井源水、出厂水和末梢水均未检出毒素;浅井水MC检出率为29.4%,其浓度范围在64～323ng/L之间;仅1份河水检出MC.结论 采用常规饮水处理措施不足以完全去除水华时期水体中的MC,需进一步对该地区饮水MC污染危险性进行评价.

Survey on Microcystins in Lake Taihu

Objective To investigate the level of microcystins(MC)in source and drinking water of a city along Lake Tiahu where toxic water blooms frequently occurred.Methods An enzyme-linked immunosorbent assay(ELISA)with a detection limit of 50ng/L,was used to monitor MC in water samples collected in J uly 2001 from 10 regions of Wuxi city,Jiangsu province in China.Of the 90 samples obtained,each 11 samples were raw and produced water from 7 waterworks that using lake or deep-well water as water sources,48 were household tap water,17 were shallow-well water,and 3 were river water.Results Heavy contamination with MC was observed in all 8 raw water samples from lake Taihu,with a range of 2 699 -14 188ng/L.Trace amount of MC(less than 100ng/L)remained in the treated and household tap water that produced from the lake water.No MC was detected in raw and treated deep-well water.MC was also detected in 5 of 17 shallow-well water,with a range of 64-323ng/L.Only 1 river water was positive for MC.Conclusion Regular water treatments might not be sufficient to remove MC from drinking water during bloom situations.More detailed investigations were required to evaluate the risk of MC contamination in the water supplied in this area.