State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China.
State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, China; School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, 212013, China.
J Environ Manage. 2019 Nov 1;249:109396. doi: 10.1016/j.jenvman.2019.109396. Epub 2019 Aug 28.
Lakes are regarded as copious antibiotic reservoirs because the antibiotics discharged by human activities mostly end up in lakes and further threaten the aqueous ecosystem. Antibiotic contamination in lakes is mostly attributed to wastewater treatment plant effluents, which change the water quality and pose ecological risks. This study investigated the concentration of 10 selected antibiotics in 17 lakes along the middle and lower reaches of the Yangtze River Basin. The correlation between antibiotics and water quality parameters were analyzed. Seven out of the 10 selected antibiotics were detected in almost all the 17 lakes with the highest concentration at 1139.40 ng/L. Sulfamethoxazole (SMZ) and erythromycin (ERY) had relatively higher concentration compared with other antibiotics. Antibiotic detection frequency was approximately 40%-100% in all 17 lakes. Ofloxacin (OFX) and naproxen (NPX) were negatively correlated (p < 0.05) with redox potential, indicating their oxidation potential in freshwater lakes. OFX showed high or medium short-term risks in some of the lakes and low or insignificant long-term risks in the corresponding lakes, respectively. In contrast, sulfadiazine and SMZ exerted low and medium short-term ecological risks and medium and high long-term risks, respectively. Roxithromycin (ROX) showed low short-term risk in seven of the 17 lakes and medium long-term risk in the corresponding lakes. NPX showed insignificant short-term and long-term risks in almost all the 17 lakes. This study fills the gap on antibiotic ecological risk assessment along the Yangtze River Basin and reveal the importance of SMZ control in the research area.
湖泊被认为是丰富的抗生素储存库，因为人类活动排放的抗生素大多最终进入湖泊，并进一步威胁到水生态系统。湖泊中的抗生素污染主要归因于污水处理厂的废水，这些废水改变了水质并带来生态风险。本研究调查了长江中下游 17 个湖泊中 10 种选定抗生素的浓度。分析了抗生素与水质参数之间的相关性。在所研究的 17 个湖泊中，几乎所有湖泊都检测到了 10 种选定抗生素中的 7 种，最高浓度为 1139.40ng/L。磺胺甲恶唑（SMZ）和红霉素（ERY）的浓度相对较高。在所有 17 个湖泊中，抗生素的检测频率约为 40%-100%。氧氟沙星（OFX）和萘普生（NPX）与氧化还原电位呈负相关（p<0.05），表明它们在淡水湖泊中的氧化电位。在一些湖泊中，OFX 表现出高或中短期风险，而在相应的湖泊中则表现出低或无显著长期风险。相比之下，磺胺嘧啶和 SMZ 分别表现出低和中短期生态风险以及中高长期风险。罗红霉素（ROX）在 17 个湖泊中的 7 个湖泊中表现出低短期风险，在相应的湖泊中表现出中高长期风险。NPX 在几乎所有 17 个湖泊中均表现出无显著短期和长期风险。本研究填补了长江流域抗生素生态风险评估的空白，并揭示了在研究区域控制 SMZ 的重要性。
