微塑料(MPs),作为一种新型的环境污染物,近年来引起了广泛关注。然而,专门针对黄河流域国会议员的研究相对较少,中国,特别是关于MP迁移模式。根据无定河(WDR)19个采样点的地表水和沉积物样本,分析了MPs的丰度和特征分布,并对影响其分布的环境因子和潜在生态风险进行了评价。结果表明,WDR的地表水和沉积物中的MP丰度存在显着差异(P<0.05)。平均值为2.98±0.69项目/L,平均值为419.47±75.61项目/kg,分别。就MP特征而言,地表水中最常见的尺寸等级为0.1-0.5毫米。聚乙烯(PE,32.50%)和聚丙烯(PP、27.50%)是地表水中MPs的主要聚合物类型。尽管在沉积物中观察到相似的MP特征,粒径<0.1mm的颗粒明显增多(P<0.05),比地表水高15.0%。此外,在沉积物样品中观察到更多的高密度MP碎片。MP在沉积物中的保留受MP特性的影响(密度,形状,粒径)和沉积物粒径。相比之下,地表水中MP的丰度与其他环境污染物的存在更密切相关,如总磷(WTP)和氨氮(WAN)。温度(T),农业用地(AGR),和居住用地(RES)仅对地表水中MP的分布有显着影响(P<0.05)。潜在的生态风险评估表明,沉积物中的MP污染比地表水中的MP污染更为严重。特别是在中下游。这项研究的结果对于了解沙质河流中的MP运输和消除MP的潜在来源非常重要。
Microplastics (MPs), as a new type of environmental pollutant, have attracted extensive attention in recent years. However, there has been relatively little research specifically focusing on MPs in the Yellow River Basin, China, particularly regarding MP migration patterns. Based on surface water and sediment samples from 19 sampling sites in the Wuding River (WDR), the abundances and characteristic distributions of MPs were analyzed, and the environmental factors affecting their distribution and potential ecological risks were evaluated. The results showed that the MP abundances in surface water and sediments of the WDR were significantly different (P < 0.05), with mean values of 2.98 ± 0.69 items/L and 419.47 ± 75.61 items/kg, respectively. In terms of MP characteristics, the most common size class was 0.1-0.5 mm in surface water. Polyethylene (PE, 32.50%) and polypropylene (PP, 27.50%) were the main polymer types of MPs in surface water. Although similar MP characteristics were observed in sediments, there were significantly more particles in the <0.1 mm particle size (P < 0.05), which was 15.0% higher than in surface water. Also, more high-density MP fragments were observed in sediment samples. The retention of MPs in sediments was influenced by the MP characteristics (density, shape, particle size) and sediment particle size. In contrast, the MP abundance in surface water was more closely related to the presence of other environmental pollutants, such as total phosphorus (WTP) and ammonia nitrogen (WAN). Temperature (T), agricultural land (AGR), and residential land (RES) only had significant effects on the distribution of MPs in surface water (P < 0.05). Potential ecological risk assessments revealed that MP pollution in sediments was more serious than in surface water, especially in the middle and lower reaches. The results of this study are important for understanding MP transport in a sandy river and for eliminating potential sources of MPs.