School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; Shanghai Engineering Research Center for Solid Waste Treatment and Resource Recovery, Shanghai 200092, China.
J Hazard Mater. 2021 Oct 5;419:126455. doi: 10.1016/j.jhazmat.2021.126455. Epub 2021 Jun 24.
Microplastic contamination in soil has received increasing attention since excessive plastic debris has been emitted directly into the terrestrial environment. Once released into the terrestrial environment, microplastics can be aged via photo- and thermally-initiated oxidative degradation, hetero-aggregation, and bioturbation. Aging affects the physiochemical properties of microplastics with the increase of surface roughness and oxygen-containing groups, which could enhance the sorption and mobility of microplastics in the soil and groundwater environment. However, the interactions among aging, sorption, and transport of microplastics in the terrestrial system have not been unveiled. This review clarifies the key processes of microplastics transport pathways in soil and groundwater ecosystems influenced by aging and sorption under various scenarios. Co-transport of microplastics and sorbed contaminants are also addressed to help understand the risks associated with heavy metals, organic contaminants, and engineered nanoparticles in the soil environment. Overall, this review elaborates the most pressing research limitations on the present literature and highlights the future perspectives to investigate the possible broad transport pathways of microplastics in soil.
土壤中的微塑料污染越来越受到关注，因为过量的塑料碎片已直接排放到陆地环境中。一旦释放到陆地环境中，微塑料就会通过光和热引发的氧化降解、异质聚集和生物搅动而老化。老化会影响微塑料的物理化学性质，增加表面粗糙度和含氧基团，从而增强微塑料在土壤和地下水环境中的吸附和迁移能力。然而，陆地系统中微塑料老化、吸附和迁移之间的相互作用尚未被揭示。本综述阐明了受老化和吸附影响的微塑料在土壤和地下水生态系统中的关键传输途径，并探讨了微塑料与吸附污染物的共同迁移，以帮助理解土壤环境中重金属、有机污染物和工程纳米颗粒所带来的风险。总的来说，本综述详细说明了目前文献中最紧迫的研究限制，并强调了未来的研究方向，以探究微塑料在土壤中的可能广泛的迁移途径。
