永定河门头沟段抗生素污染特征及风险评估

Antibiotic pollution characteristics and risk assessment of surface water in Yongding River Mentougou District

采用高效液相色谱-串联三重四极杆质谱对永定河门头沟辖区段(包括官厅水库下游、斋堂水库支流汇入后的干流和城区段)内水体中的抗生素污染特征及风险进行评估.研究结果表明,氟苯尼考、奥索利酸、磺胺甲噁唑在3段流域内均有检出,平均浓度分别为4.95,2.56,13.96ng/L.磺胺吡啶从支流汇入,检出率为54%,浓度自2.36ng/L上升至4.06ng/L.城区段受生活污水排放等影响,氧氟沙星含量显著增加,浓度达到7.93ng/L.永定河门头沟辖区段内水体整体无健康风险,但在进入城区段后,其生态风险与抗性风险有所上升,可能是由于人类活动水平上升所致,需要进一步关注.

Antibiotic pollution characteristics and risks in Mentougou District section of Yongding River(including the downstream of Guanting Reservoir,the main stream after the tributaries of Zaitang Reservoir converge,and the urban section)were evaluated by high performance liquid chromatography-tandem triple quadrupole mass spectrometry.The results showed that florfenicol,olsalazine,and sulfamethoxazole were detected in all three sections,with average concentrations of 4.95ng/L,2.56ng/L,and 13.96ng/L,respectively.Sulfapyridine was introduced from tributaries with a detection rate of 54%,and the concentration increased from 2.36ng/L to 4.06ng/L.The content of ofloxacin increased significantly in the urban section due to the impact of domestic sewage discharge,reaching a concentration of 7.93ng/L.Overall,there was no health risk in the Mentougou District section of Yongding River.However,after entering the urban section,the ecological and resistance risks increased,which may be due to the increase of human activity levels and requires further attention.