某市典型地段地表水及地下水中氟喹诺酮类抗生素分布特征

Distribution Characteristics of Fluoroquinolones Antibiotics in Surface Water and Groundwater from Typical Areas in A City

为初步了解某市水体中5种典型氟喹诺酮类抗生素(FQs)的污染特征,对该市主要排污河与典型地段采集地表水与地下水,分别对水样进行常规指标测试与FQs浓度测试分析.结果表明,地表水与地下水中FQs的含量水平和组成特征差异明显.地表水中FQs总含量水平整体高于地下水;地表水中FQs浓度平均值为789.1 ng·L-1,主要以氧氟沙星(OFL)与洛美沙星(LOM)为主;地下水中FQs浓度平均值为342.7 ng·L-1,主要以诺氟沙星(NOR)与洛美沙星(LOM)为主,恩诺沙星(ENR)在地表水与地下水的含量水平均偏低.地表水体中FQs含量水平表现为沟渠>支流>干流.该市排污河水系傍河剖面地下水中FQs含量水平高于其他地段.傍河剖面处地下水中FQs监测浓度随着采样点与河道距离的增加呈现递减趋势,且各组分变化趋势基本一致,初步证实河水可能是河道周边地下水中FQs的主要来源.

In order to investigate the characteristics of 5 typical kinds of fluoroquinolones( FQs) pollution in waters from a city,surface water and groundwater samples from main drainage rivers and typical areas were collected,respectively. The conventional test and FQs concentrations analysis of the water samples were conducted. The results showed the concentration and composition of FQs in groundwater differed substantially from those in surface water. The average concentration of FQs in surface water was 789. 1 ng·L- 1with the main components of ofloxacin( OFL) and lomefloxacin( LOM). This value was higher than the average concentration of FQs in groundwater: 342. 7 ng·L- 1with the main components of norfloxacin( NOR) and lomefloxacin( LOM). The enrofloxacin( ENR)exhibited relatively lower levels in both surface water and groundwater as compared to others. The highest FQs concentrations in surface water were found in trenches,followed by tributaries and the main stream. For groundwater,FQs concentrations were relatively higher in the sewage riverside. A decreasing trend of FQs concentration was monitored with the increasing distance of sampling points to the drainage rivers and all components mentioned above showed similar changing trends. The results of this study preliminarily indicated that FQs in groundwater along the riverside probably came from the surface water.