城市公园的水质与人们的日常生活息息相关,但是公园水和沉积物中微塑料造成的污染尚未得到全面研究。因此,长沙市区的八个典型公园,中国,被选中,拉曼光谱用于探索水和沉积物中微塑料的空间分布和组成,分析其影响因素,并评估其环境风险。结果表明,所有公园的地表水微塑料丰度范围为150至525nL-1,沉积物微塑料丰度范围为120至585nkg-1。地表水中的微塑料包括聚对苯二甲酸乙二醇酯(PET),氯化聚乙烯(CPE),和氟橡胶(FLU),沉积物中含有聚氯乙烯(PVC),wp-丙烯酸酯共聚物(ACR),和CPE。回归分析显示,人类活动与公园中微塑料的丰度之间存在显着的正相关关系。其中,人口的相关性,工业排放和生活废水排放,公园水中的微塑料含量最高。然而,汽车流量和游客与公园水中大量微塑料的相关性最弱。基于潜在生态风险指数(PERI)分类评估方法,八个公园的水域和沉积物中的微塑料含量均在II级风险区(53-8,549)内,其中梅溪湖和玉带湖的风险指数在IV风险区(1,365-8,549)内,这可能是由于公园附近人口密度高造成的。这项研究为城市公园水和沉积物中的微塑料特性提供了新的见解。
The quality of water in urban parks is closely related to people\'s daily lives, but the pollution caused by microplastics in park water and sediments has not been comprehensively studied. Therefore, eight typical parks in the urban area of Changsha, China, were selected, and Raman spectroscopy was used to explore the spatial distributions and compositions of the microplastics in the water and sediments, analyze their influencing factors, and evaluate their environmental risks. The results showed that the abundances of surface water microplastics in all parks ranged from 150 to 525 n L-1, and the abundances of sediment microplastics ranged from 120 to 585 n kg-1. The microplastics in the surface water included polyethylene terephthalate (PET), chlorinated polyethylene (CPE), and fluororubber (FLU), while those in the sediments included polyvinyl chloride (PVC), wp-acrylate copolymer (ACR), and CPE. Regression analyses revealed significant positive correlations between human activities and the abundances of microplastics in the parks. Among them, the correlations of population, industrial discharge and domestic wastewater discharge with the abundance of microplastics in park water were the strongest. However, the correlations of car flow and tourists with the abundance of microplastics in park water were the weakest. Based on the potential ecological risk indices (PERI) classification assessment method, the levels of microplastics in the waters and sediments of the eight parks were all within the II-level risk zone (53-8,549), among which the risk indices for Meixi Lake and Yudai Lake were within the IV risk zone (1,365-8,549), which may have been caused by the high population density near the park. This study provides new insights into the characteristics of microplastics in urban park water and sediment.