Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing, 210044, China.
Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution Control, Jiangsu Joint Laboratory of Atmospheric Pollution Control, Nanjing, 210044, China.
Environ Sci Pollut Res Int. 2018 Mar;25(9):8943-8950. doi: 10.1007/s11356-017-1132-6. Epub 2018 Jan 13.
Surface-deposited sediment in urban areas is an essential environmental medium for assessing nutrient contamination. The total nitrogen (TN) and total phosphorus (TP) pollution associated with surface-deposited sediments can be transported into urban water bodies by runoff and can cause eutrophication of those water bodies. By analyzing the samples collected on roof surfaces and road surfaces, this study provides a comparison of the differences in TN and TP pollution loading in sediments on these two different impervious surface materials. Also, an assessment of the ecological risk of nutrients in surface-deposited sediments with respect to grain size fraction was performed. The results indicate that the TN and TP pollution loading in both road-deposited sediments and roof-deposited sediments indicated an asymmetric "W" trend along with grain size fraction, and both road-deposited sediments and roof-deposited sediments had the highest TN and TP pollution contribution when the particle size is between 250 and 500 μm. TN in roof-deposited sediments has high ecological risk when the particle size is less than 250 μm. These findings help to provide guidance for the management of surface-deposited sediment pollution.
城市地表沉积物是评估营养物污染的重要环境介质。地表沉积物中与总氮（TN）和总磷（TP）相关的污染可通过径流进入城市水体，并导致这些水体富营养化。本研究通过对屋顶表面和道路表面采集的样本进行分析，比较了这两种不同的不透水表面材料上沉积物中 TN 和 TP 污染负荷的差异。此外，还评估了不同粒级的地表沉积物中营养物的生态风险。结果表明，道路沉积物和屋顶沉积物中的 TN 和 TP 污染负荷随粒级呈不对称“W”趋势，道路沉积物和屋顶沉积物的 TN 和 TP 污染贡献最大，粒径在 250-500μm 之间。当粒径小于 250μm 时，屋顶沉积物中的 TN 具有高生态风险。这些发现有助于为地表沉积物污染的管理提供指导。
