Key Laboratory for Environment and Disaster Monitoring and Evaluation, Hubei, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China.
Key Laboratory for Environment and Disaster Monitoring and Evaluation, Hubei, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China.
Sci Total Environ. 2017 Dec 31;609:1423-1432. doi: 10.1016/j.scitotenv.2017.08.009. Epub 2017 Aug 8.
The occurrence and temporal-spatial distributions of 13 antibiotics (tetracyclines, sulfonamides, and fluoroquinolones) in the water of a high-intensity aquaculture lake, Honghu Lake, and its associated river network and ponds were investigated. Tetracycline, oxytetracycline, chlortetracycline, and sulfadiazine are the four dominant antibiotics in this region, with maximum and median concentrations of 1454.8 and 304.8ng/L, 2796.6 and 161.9ng/L, 1431.3 and 349.9ng/L, and 499.5 and 106.5ng/L, respectively. The median concentrations of the other nine antibiotics are lower than 57.1ng/L. The highest contaminated sites are located in the Four-lake main canal and its lake inlets. Antibiotic concentrations were higher in November than in May and the concentrations were strongly correlated with water temperature, dissolved oxygen, and nitrates according to redundancy analysis. The source analysis indicated that besides untreated domestic and husbandry sewage, the aquaculture in the lake and ponds is a main source of antibiotics in the study region. The environmental hazards posed by the selected antibiotics were assessed by using the methods of hazard quotient and mixture hazard quotient. The results suggested that tetracycline, oxytetracycline, sulfadiazine, and ciprofloxacin pose medium to high ecological hazard to algae in almost all of the water samples, and the high combination ecological hazards of antibiotics are mainly posed by the high individual hazard quotient of tetracycline in the study area.
本研究调查了高强度水产养殖湖泊洪湖及其相关河网和池塘水中 13 种抗生素（四环素类、磺胺类和氟喹诺酮类）的发生和时空分布。四环素、土霉素、金霉素和磺胺嘧啶是该地区的四种主要抗生素，其最大和中位数浓度分别为 1454.8 和 304.8ng/L、2796.6 和 161.9ng/L、1431.3 和 349.9ng/L 和 499.5 和 106.5ng/L。其他九种抗生素的中位数浓度均低于 57.1ng/L。污染最严重的地点位于四湖主渠及其入湖口。根据冗余分析，11 月的抗生素浓度高于 5 月，且浓度与水温、溶解氧和硝酸盐密切相关。来源分析表明，除未经处理的生活污水和养殖业污水外，湖泊和池塘养殖也是研究区域抗生素的主要来源。采用危害商数和混合危害商数的方法评估了所选抗生素的环境危害。结果表明，在几乎所有水样中，四环素、土霉素、磺胺嘧啶和环丙沙星对藻类均具有中到高的生态危害，而研究区域中抗生素的高组合生态危害主要是由四环素的高个体危害商数引起的。
