School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China; Key Laboratory of Yellow River Water Environment in Gansu Province, Lanzhou Jiaotong University, Lanzhou 730070, China.
School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China; Key Laboratory of Yellow River Water Environment in Gansu Province, Lanzhou Jiaotong University, Lanzhou 730070, China.
Mar Pollut Bull. 2024 Oct;207:116900. doi: 10.1016/j.marpolbul.2024.116900. Epub 2024 Sep 5.
Microplastic (MP) is an emerging pollutant that has attracted attention in the environmental field, and the research of MPs in freshwater systems needs to be strengthened. To characterize the MPs in surface water and sediments of the western urban river network, water and sediment samples were collected. The results showed that the abundance of MPs in the water body of the river network ranged from 7 to 172 n/L, whereas the abundance of MPs in the sediments ranged from 7 to 144 n/kg, and the average abundance in the dry season was significantly higher than that in the rainy season. The majority of MPs (83.67 %) were < 1 mm and fibrous. The most commonly identified types of MPs were PET and PP, while the color blue was frequently observed. MPs have the potential to vertically migrate in sediments, with size, shape, density, and hydrodynamic forces being the main factors that contribute to this process. Correlation analysis results revealed that anthropogenic and meteorological factors, including precipitation, atmospheric conditions, and population density, had a discernible impact on the abundance, size, and shape of MPs. The ecological risk of MPs was assessed using the Polymer Hazardous Index (PHI), Pollution Load Index (PLI), and Potential Ecological Risk Index (PERI) methods, and the results showed that the overall ecological risk of the Lanzhou section of the Yellow River was low. This study can provide a scientific basis for monitoring and risk assessment of emerging contaminants such as MPs in the river environment.
微塑料（MP）是一种新兴的污染物，在环境领域引起了关注，需要加强对淡水系统中 MPs 的研究。为了描述西部城市河网地表水和沉积物中的 MPs，采集了水样和沉积物样品。结果表明，河网水体中 MPs 的丰度范围为 7 至 172 纳升/升，而沉积物中 MPs 的丰度范围为 7 至 144 纳克/千克，旱季的平均丰度明显高于雨季。大多数 MPs（83.67%）<1 毫米且呈纤维状。最常见的 MPs 类型是 PET 和 PP，而蓝色是最常观察到的颜色。MPs 有可能在沉积物中垂直迁移，尺寸、形状、密度和水动力是促进这一过程的主要因素。相关分析结果表明，降水、大气条件和人口密度等人为和气象因素对 MPs 的丰度、尺寸和形状有明显影响。使用聚合物危害指数（PHI）、污染负荷指数（PLI）和潜在生态风险指数（PERI）方法评估 MPs 的生态风险，结果表明黄河兰州段的整体生态风险较低。本研究可为监测和评估河网环境中 MPs 等新兴污染物的风险提供科学依据。
