School of Marine Science and Engineering, Nanjing Normal University, Nanjing 210023, China.
Center for Eco-Environmental Research, Nanjing Hydraulic Research Institute, Nanjing 210029, China.
Sci Total Environ. 2022 Aug 15;834:155176. doi: 10.1016/j.scitotenv.2022.155176. Epub 2022 Apr 18.
Global climate change increased the frequency of extreme rainfall events, leading to higher flood risk. In addition to the personal and property losses, another important consequence of a flood disaster was release and exposure risks from emerging contaminants, which was usually overlooked. The remobilization and fate of the antibiotics induced by floods remain unclear. We captured antibiotic concentrations around the Chaohu Lake after an unprecedented flood with a range of 5.0-317 ng/L. Higher concentrations in polder waters than their receiving rivers were attributed to the antibiotic release from soil particles and the sharp increase of water: soil ratio by flood storage. Source apportionment analysis of antibiotics implied that diffuse pollution by manure application and aquaculture activity was the predominant sources. Commonalities of spatial variations of antibiotics in polders were related to the condition of waterlogging and pollution source. The total antibiotic storage for all submerged polders was estimated at 27.9 kg. The concentrations and risks from pumping floodwater detained by polders into the lake were much higher than that from discharging flood directly into the lake. The retention-reaction-remobilization process would pose unexpectedly high risks for the lake. This study provided a new sight for constructing ecological wetland flood storage areas.
全球气候变化增加了极端降雨事件的频率，导致洪水风险增加。除了人员和财产损失外，洪水灾害的另一个重要后果是新兴污染物的释放和暴露风险，而这通常被忽视。洪水引发的抗生素的再迁移和归宿仍不清楚。我们在一次前所未有的洪水中在巢湖周围捕捉到了 5.0-317ng/L 范围的抗生素浓度。圩区水中的浓度高于其接受河流，这归因于洪水储存过程中土壤颗粒中抗生素的释放和水:土壤比例的急剧增加。抗生素的来源分配分析表明，粪肥施用和水产养殖活动的面源污染是主要来源。圩区抗生素空间变化的共性与渍水条件和污染源有关。所有淹没圩区的总抗生素储存量估计为 27.9 千克。从圩区抽入湖泊的洪水的浓度和风险远高于直接排入湖泊的洪水。保留-反应-再迁移过程将对湖泊构成意外的高风险。本研究为构建生态湿地蓄洪区提供了新的视角。
