Distribution characteristics and ecological risk assessment of quinolone antibiotics in Qingshitan Reservoir, Guangxi Province

Abstract

利用高效液相色谱法对桂林市青狮潭水库喹诺酮类抗生素（氧氟沙星（OFX）、诺氟沙星（NOR）、环丙沙星（CIP）、恩诺沙星（ENR））进行监测，并分析其污染来源和生态风险.结果表明：青狮潭水库水体中氧氟沙星、诺氟沙星、环丙沙星和恩诺沙星的检出浓度范围分别为50.00~660.13、3.70~5.00、3.49~6.22和4.59~6.06 ng/L；与国内河流抗生素浓度水平相比，青狮潭水库水体中喹诺酮类抗生素浓度处于中等偏低水平；青狮潭水库水体喹诺酮类抗生素浓度与水体理化性质的相关性分析表明：NOR浓度与pH相关性极显著、与浊度相关性显著，CIP浓度与总磷浓度相关性显著，OFX和ENR浓度与理化指标无显著相关性；生态风险评价结果表明青狮潭水库东湖区、西湖区水体中OFX存在高风险，NOR、CIP与ENR处于中等风险水平.;The residues of quinolone antibiotics-ofloxacin (OFX), norfloxacin (NOR), ciprofloxacin (CIP) and enrofloxacin (ENR) in Qingshitan Reservoir were detected by high performance liquid chromatography (HPLC). Correlation between the concentrations of antibiotics and physical-chemical properties of water was analyzed, and ecological risk was evaluated by risk quotient method as well. The results showed that the ranges of OFX, NOR, CIP and ENR in Qingshitan Reservoir were 50.00-660.13, 3.70-5.00, 3.49-6.22 and 4.59-6.06 ng/L, which were at the medium level or slightly lower level comparing with the concentrations of antibiotics in domestic rivers. The NOR concentration was significantly correlated with pH and turbidity, and the CIP concentration was significantly correlated with total phosphorus (TP) concentration. While there was no significant correlation between OFX and ENR concentration and all other physicochemical indicators of water. The ecological risk assessment showed that OFX had posed a high risk in the western and eastern areas of Qingshitan Reservoir, while NOR, CIP and ENR were found to pose a moderate risk.