绍兴市重要水域微囊藻毒素污染状况调查

Pollution of microcystins in waters in Shaoxing City

目的了解绍兴市重要水域微囊藻毒素污染情况,为水质安全风险评估和治理提供依据。方法于2016年9月—2017年9月在绍兴市三大水域设置15个点进行水样采集,采用超高效液相色谱-串联质谱法对6种微囊藻毒素(MC-LR、MC-RR、MC-YR、MC-LA、MC-LY、MC-LF)进行检测,比较不同时间、地点采集水样的微囊藻毒素检出情况。结果共采集水样135份,检出微囊藻毒素22份,检出率为16.3%。萧绍河网、浦阳江流域和曹娥江流域采集水样检出率分别为7.9%、18.5%和26.7%;7月、8月和9月采集水样检出率分别为13.3%、40.0%和46.7%,其他月份均未检出。22份阳性样品中,6种微囊藻毒素检出率由高到低为MC-LR(100.0%)、MC-RR(100.0%)、MC-YR(22.7%)、MC-LY(18.2%)、MC-LF(13.6%)和MC-LA(0.0%)。结论绍兴市三大水域夏秋季均存在微囊藻毒素污染,以MC-LR和MC-RR为主。

Objective To understand microcystins(MCs)pollution in important waters of Shaoxing,so as to provide evidence for risk assessment and supervision of water quality safety.Methods Water samples were collected from 15 points set in three Shaoxing waters during September 2016 to September 2017.Six kinds of MCs(MC-LR,MC-RR,MC-YR,MC-LA,MC-LY,MC-LF)in samples were detected by ultra performance liquid chromatography tandem mass spectrometry,and the results were compared according to different time and place.Results MCs were detected positive in 22 of the 135 samples,the total detection rate was 16.3%.The detection rates of Xiaoshao River,Puyang River and Cao′e River were 7.9%,18.5%和26.7%respectively;the detection rates in July,August and September were 13.3%,40%and 46.7%respectively,and the other months were not detected.In 22 positive samples,the detection rates of 6 MCs from high to low as follows:MC-LR(100%),MC-RR(100%),MC-YR(22.7%),MC-LY(18.2%),MC-LF(13.6%)and MC-LA(0%).Conclusion In the three important waters of Shaoxing,microcystins were polluted in summer and autumn,which were mainly MC-LR and MC-RR.