Soil structures and immobilization of typical contaminants in soils in response to diverse microplastics
Soil structures and immobilization of typical contaminants in soils in response to diverse microplastics
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DOI：
10.1016/j.jhazmat.2022.129555
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发表时间：
2022-07-11
影响因子：
13.6
通讯作者：
Xing, Baoshan
中科院分区：
文献类型：
--
作者：
Chen, Liying;Han, Lanfang;Xing, Baoshan
土壤生态系统中微塑料（MP）的积累已成为一个世界性问题。 MP 对土壤结构和污染物迁移的影响尚未明确阐明。本研究进行了涵盖四种不同处理的土柱实验：不含 MPs 的土壤（CK）、含有 0.5 wt% 聚乙烯的土壤（S+PE）、含有 0.5 wt% 聚丙烯腈的土壤（S+PAN）和含有 0.5 wt% 聚对苯二甲酸乙二醇酯的土壤（S+PET）。探讨了 MP 引起的土壤结构变化和土壤对典型疏水性有机污染物（例如菲 (PHE)）和重金属（例如铅 (Pb (II))）吸附效率变化之间的相互关系。与 CK 相比，添加 MP 的土壤含有较少的大团聚体和较低的团聚体稳定性。三种 MP，特别是 PE，促进了土壤对 PHE 的吸附，但减少了 Pb (II) 的吸附，这种情况发生在含有实验和预测吸附能力的比较，以及不同团聚体尺寸的单点吸附数据表明，PHE 和 Pb (II) 吸附的这种变化除了与土壤与 MPs 的物理混合物有关外，还与土壤团聚体的变化有关。
Microplastics (MPs) accumulation in soil ecosystems has become a worldwide issue. The influence of MPs on soil structures and contaminant transport has not been clearly unraveled. This study conducted soil column experiments covering four different treatments: soil without MPs (CK), soil with 0.5 wt% polyethylene (S+PE), soil with 0.5 wt% polyacrylonitrile (S+PAN), and soil with 0.5 wt% polyethylene terephthalate (S+PET). The interconnections between changes in soil structures and shifts in sorption efficiency for typical hydrophobic organic contaminants (e.g., phenanthrene (PHE)) and heavy metal (e.g., lead (Pb (II)) by soils induced by MPs were explored. MPs-added soils contained fewer macro-aggregates and lower aggregate stability compared to CK. Three MPs, particularly PE, promoted PHE sorption by soils but reduced Pb (II) sorption, which occurred in soils with or without dissolved organic carbon. The comparison between experimental and predicted sorption capacity, as well as the one-point sorption data of different aggregate sizes, showed that such variations in PHE and Pb (II) sorption were related to the shifts in soil aggregates besides from the physical mixture of soils with MPs.