Ma Naijin, Tong Lei, Li Yuqiong, Yang Cong, Tan Qin, He Jun
School of Environmental Studies, China University of Geosciences, 430074, Wuhan, PR China.
School of Environmental Studies, China University of Geosciences, 430074, Wuhan, PR China; State Environmental Protection Key Laboratory of Source Apportionment and Control of Aquatic Pollution, Ministry of Ecology and Environment, PR China; Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, PR China.
Environ Res. 2022 Mar;204(Pt C):112343. doi: 10.1016/j.envres.2021.112343. Epub 2021 Nov 5.
Antibiotics pollution in lakes has been widely reported worldwide, however rare studies were concerned about antibiotics distribution in lake water - groundwater - sediment system. Here, a total of 22 antibiotics and 4 sulfonamides metabolites were detected in lake water, sediments, and different depth of groundwater surrounding Chenhu Lake during the wet and dry seasons. N-acetylsulfonamides (Ac-SAs), fluoroquinolones (FQs), and tetracyclines (TCs) were the main groups of antibiotics in the study area. In the whole lake environment, there were more types of antibiotics in the aquatic environments than in the sediments, and the antibiotics distribution was closely related to geographical location. Specifically, the average concentration of antibiotics in groundwater decreased with an increase in sampling site distance from the lake. All antibiotics, except oxytetracycline (OTC), showed a significant decline during the dry season that could be due to the implementation of lake conservation policies, which significantly helped reducing lake pollution. There were obvious differences in the distribution of antibiotics in distinct sedimentary environments. In the surface sediments, the antibiotics content in the reclamation and the perennially flooded areas was higher than in the lakeshore area. The hydraulic interactions in the perennial flooded area facilitated the deep migration of antibiotics into lake sediments. Correlation analysis revealed a good relevance between the distribution of antibiotics in lake water and groundwater. Redundancy analysis shows that dissolved oxygen and temperature were the main factors affecting the distribution of antibiotics.
湖泊中的抗生素污染在全球范围内已被广泛报道，然而，关注抗生素在湖水-地下水-沉积物系统中分布的研究却很少。在此，在雨季和旱季期间，对沉湖周边的湖水、沉积物以及不同深度的地下水中总共检测出了22种抗生素和4种磺胺类代谢物。N-乙酰磺胺类（Ac-SAs）、氟喹诺酮类（FQs）和四环素类（TCs）是研究区域内的主要抗生素类别。在整个湖泊环境中，水生环境中的抗生素种类比沉积物中的更多，且抗生素的分布与地理位置密切相关。具体而言，地下水中抗生素的平均浓度随着采样点距湖泊距离的增加而降低。除土霉素（OTC）外，所有抗生素在旱季均显著下降，这可能是由于湖泊保护政策的实施，该政策显著有助于减少湖泊污染。不同沉积环境中抗生素的分布存在明显差异。在表层沉积物中，围垦区和常年淹水区的抗生素含量高于湖岸区。常年淹水区的水力相互作用促进了抗生素向湖泊沉积物的深层迁移。相关性分析表明，湖水和地下水中抗生素的分布之间具有良好的相关性。冗余分析表明，溶解氧和温度是影响抗生素分布的主要因素。
