Yu Xiaoqin, Zhao Yimo, Zhang Chutian, Yang Chengfang, Ouyang Zhuozhi, Liu Peng, Guo Xuetao, Zhu Lingyan
College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China.
College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China; Key Laboratory of Plant Nutrition and the Agro-environment in Northwest China, Ministry of Agriculture, Yangling, Shaanxi 712100, China.
Sci Total Environ. 2022 Feb 1;806(Pt 4):150953. doi: 10.1016/j.scitotenv.2021.150953. Epub 2021 Oct 14.
Microplastics (MPs), as a new type of pollutants, have attracted wide attention especially in recent years, but there was insufficient research on the distribution and characteristics of MPs in urban park water body. In this study, the pollution of MPs in water and sediment of Xi'an, the largest city in northwest China, was investigated. The MPs concentration in the surface water and sediment was 2900-6970 items/m and 940-3560 items/kg, respectively. According to the urban functions, the parks were divided into residential areas, commercial areas, tourism areas and industrial areas, and the highest abundance of MPs was observed in the tourism and residential areas, suggesting the impacts of human activities. MPs in these parks were mainly in four kinds of shapes, namely fiber, pellet, fragment and film, and dominated by fibers and fragments. Most of the extracted MPs were small in size, and 63-92% of them were smaller than 0.5 mm. Polypropylene and polyethylene terephthalate were the main polymer types in surface water and sediments, respectively. This study showed that the park water and sediment can be used as an important "sink" in MPs, which is of great significance for monitoring and alleviating the pollution of urban MPs. This study provided important reference for better understanding MPs levels in inland freshwaters.
微塑料（MPs）作为一种新型污染物，近年来尤其受到广泛关注，但关于城市公园水体中微塑料的分布和特征的研究还不够充分。本研究调查了中国西北最大城市西安水体和沉积物中的微塑料污染情况。地表水和沉积物中微塑料的浓度分别为2900 - 6970个/立方米和940 - 3560个/千克。根据城市功能，公园被分为居民区、商业区、旅游区和工业区，其中旅游区和居民区的微塑料丰度最高，表明受到了人类活动的影响。这些公园中的微塑料主要有纤维、颗粒、碎片和薄膜四种形状，以纤维和碎片为主。提取的微塑料大多尺寸较小，其中63% - 92%小于0.5毫米。聚丙烯和聚对苯二甲酸乙二酯分别是地表水和沉积物中的主要聚合物类型。本研究表明，公园水体和沉积物可作为微塑料的重要“汇”，这对于监测和减轻城市微塑料污染具有重要意义。本研究为更好地了解内陆淡水水体中的微塑料水平提供了重要参考。
