Shen Minghui, Li Yang, Qin Liwen, Chen Xudong, Ao Tianyu, Liang Xishu, Jin Kaibo, Dou Yanyan, Li Juexiu, Duan Xuejun
School of Smarts Energy and Environment, Zhongyuan University of Technology, Zhengzhou, 450007, China.
Sci Rep. 2025 Jan 2;15(1):468. doi: 10.1038/s41598-024-84894-z.
The current researches on microplastics in different water layers of reservoirs remains limited. This study aims to investigate the microplastics in different water layers within a source water reservoir. Results revealed that the abundance of microplastics ranged from 2.07 n/L to 14.28 n/L (reservoir, water) and 3 to 7.02 n/L (river, water), while varied from 350 to 714 n/kg (reservoir, sediment) and 299 to 1360 n/kg (river, sediment). The average abundance in surface, middle, and bottom water were 6.83 n/L, 6.30 n/L, and 6.91 n/L respectively. Transparent fibrous smaller than < 0.5 mm were identified as the predominant fraction with Polypropylene and Polyethylene being the prevalent polymer types. Additionally, the pollution load index, hazard index, and pollution risk index were calculated for different layers and sediments. Results showed that surface water exhibited a moderate level of risk while the sediments posed a low level of risk. Both the middle and bottom water showed elevated levels of risk due to higher concentrations of polymers with significant toxicity indices. This study presents novel findings on the distribution of microplastics in different water layers, providing crucial data support for understanding the migration patterns of microplastics in source water reservoirs and facilitating pollution prevention efforts.
目前关于水库不同水层中微塑料的研究仍然有限。本研究旨在调查水源水库不同水层中的微塑料。结果显示，微塑料的丰度范围为2.07 n/L至14.28 n/L（水库，水体）和3至7.02 n/L（河流，水体），而在沉积物中则为350至714 n/kg（水库，沉积物）和299至1360 n/kg（河流，沉积物）。表层、中层和底层水的平均丰度分别为6.83 n/L、6.30 n/L和6.91 n/L。小于0.5毫米的透明纤维被确定为主要部分，聚丙烯和聚乙烯是普遍存在的聚合物类型。此外，还计算了不同水层和沉积物的污染负荷指数、危害指数和污染风险指数。结果表明，地表水呈现出中等程度的风险，而沉积物的风险较低。中层和底层水由于具有显著毒性指数的聚合物浓度较高，显示出较高的风险水平。本研究提供了关于微塑料在不同水层中分布的新发现，为了解微塑料在水源水库中的迁移模式和促进污染防治工作提供了关键的数据支持。
