Environmentally relevant concentrations of microplastic exhibits negligible impacts on thiacloprid dissipation and enzyme activity in soil

文献类型： 外文期刊

第一作者： Xu, Zhenlan

作者： Xu, Zhenlan;Zhang, Chunrong;Tang, Tao;Zhao, Xueping;Qian, Xiaoting;Li, Lingxiangyu;Wang, Chao

作者机构：

关键词： Microplastics; Thiacloprid; Dissipation; Enzyme activity; Adsorption

期刊名称：ENVIRONMENTAL RESEARCH （ 影响因子：5.715； 五年影响因子：5.735 ）

ISSN： 0013-9351

年卷期： 2020 年 189 卷

页码：

收录情况： SCI

摘要： Microplastics (MPs) as a type of emerging contaminant in the environment have attracted extensive attentions in recent years, and understanding the impacts of MPs on soil biodiversity and functioning are thus increasingly urgent. Nevertheless, few studies were performed to investigate potential effects of MPs on decay of soil organic pollutants in particular pesticides and enzyme activities. Herein, three types of MPs including polystyrene fragments (PS-50) and polyvinyl chloride beads (PVC-42000 and PVC-10) were added to soil at environmentally relevant concentrations (0.2 and 1.0%) to study their impacts on dissipation of thiacloprid and activities of urease, acid phosphatase, invertase and catalase. MPs exhibited negligible impacts on thiacloprid dissipation regardless of MPs type and content, being probably attributed to the unaltered bioavailability of thiacloprid in soil even after an addition of MPs, which was documented by using the hydroxypropyl-beta-cyclodextrin (HPCD) extraction method. Batch sorption experiments also exhibited the comparable adsorption capacity of thiacloprid to soil with and without MPs, along with K-f valuses of 3.44-3.77. Besides, MPs exerted negligible effects on enzyme activities of soil. Taken together, this study showed negligible impacts of MPs at environmentally relevant concentrations on thiacloprid dissipation and enzyme activity, expanding our knowledge on impacts of MPs at the environmentally relevant concentrations on pesticide dissipation in soil.

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