Chen Hao, Chen Yanhua, Xu Yibo, Xiao Chuanqi, Liu Jincheng, Wu Renren, Guo Xuetao
College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi 712100, China.
Institute of Plant Nutrition, Resources and Environment, Beijing Academy of Agriculture and Forestry Sciences, Beijing 100097, China.
Sci Total Environ. 2022 Dec 15;852:158581. doi: 10.1016/j.scitotenv.2022.158581. Epub 2022 Sep 6.
Microplastics (MPs) pollution in the environment has become a global hotspot, but there is insufficient research on MPs in soils of large cities. This study investigated the pollution status of MPs in soils in different functional areas (commercial, tourist, industrial, and residential areas) of the Xi'an metropolitan area. The average abundances of MPs were 2218 items/kg in Xi'an city, 1329 items/kg in Xianyang city and 1400 items/kg in Yangling city. All MPs presented different shapes and were dominated by fragment and fiber. The 0-0.5 mm MPs accounted for the largest proportion. Polyethylene terephthalate (PET) was the predominant polymer type for MPs. The results showed that the soil in the Xi'an metropolitan area was polluted by MPs, with the pollution of MPs in Xi'an city being more severe than other two cities. This could be related to the advanced urbanization and industrialization process. Moreover, industrial and tourist areas had frequent industrial and human activities, so their MPs pollution was the worst. In addition, residential areas and some commercial areas far away from pollution sources had lower pollution levels and a more uniform distribution of MPs. This study may provide data and valuable reference for the investigation of soil MPs pollution in the Xi'an metropolitan area.
环境中的微塑料（MPs）污染已成为全球热点问题，但针对大城市土壤中微塑料的研究尚不充分。本研究调查了西安大都市区不同功能区（商业区、旅游区、工业区和居民区）土壤中微塑料的污染状况。西安市微塑料的平均丰度为2218个/千克，咸阳市为1329个/千克，杨凌市为1400个/千克。所有微塑料呈现出不同形状，且以碎片和纤维为主。0-0.5毫米的微塑料占比最大。聚对苯二甲酸乙二酯（PET）是微塑料的主要聚合物类型。结果表明，西安大都市区的土壤受到微塑料污染，其中西安市的微塑料污染比其他两个城市更为严重。这可能与城市化和工业化进程的推进有关。此外，工业区和旅游区的工业和人类活动频繁，因此其微塑料污染最为严重。此外，远离污染源的居民区和一些商业区污染水平较低，微塑料分布更为均匀。本研究可为西安大都市区土壤微塑料污染调查提供数据和有价值的参考。
