Occurrence, distribution, and characteristics of microplastics in agricultural soil around a solid waste treatment center in southeast China

Xi Liu; Huirong Lin; Sheng Xu; Yu Yan; Ruilian Yu; Gongren Hu

doi:10.1007/s11368-022-03341-6

Occurrence, distribution, and characteristics of microplastics in agricultural soil around a solid waste treatment center in southeast China

J Soils Sediments. 2023;23(2):936-946. doi: 10.1007/s11368-022-03341-6. Epub 2022 Sep 28.

Authors

Xi Liu¹, Huirong Lin¹, Sheng Xu¹, Yu Yan¹, Ruilian Yu¹, Gongren Hu¹

Affiliation

¹ Department of Environmental Science and Engineering, Huaqiao University, Xiamen, 361021 China.

Abstract

Purpose: In recent years, microplastic (MP) contamination has raised enormous concern. However, data on the influence of solid waste treatment systems on MP pollution around agricultural soil are lacking. This study investigated the distribution and characteristics of MPs in agricultural soil surrounding a solid waste treatment center in southeastern China.

Materials and methods: Fifty-seven agricultural topsoil samples around the solid waste treatment center were collected. The samples were pretreated by drying, flotation separation using NaCl solution, and digestion by H₂O₂. The abundance and morphological characteristics of MPs were determined by a microscope, followed by Raman spectroscopy analysis identified polymer types and SEM-EDS analysis observed surface morphology and the type of metals accumulated on the MPs.

Results and discussion: Soil MPs' abundance ranged from 280 to 2360 items/kg, while a higher abundance of MPs was distributed in the downwind area. The < 1-mm MPs were dominant, and white fragment MPs were widely found. Polyethylene (52.86%) and polypropylene (27.14%) were the most common. Moreover, SEM-EDS images illustrated that MPs were significantly weathered and showed the uneven distribution of metal(loid) elements on the surface, implying that MPs may migrate as heavy metal vectors to threaten agroecosystem safety.

Conclusions: This study reveals the distribution and characteristics of MPs in agricultural soil surrounding a solid waste treatment center in southeastern China, as well as the potential source of soil MPs, and provides systematic data for further research on MP pollution in agricultural soil.

Supplementary information: The online version contains supplementary material available at 10.1007/s11368-022-03341-6.

Keywords: Agricultural soil; Distribution; Microplastics; Solid waste treatment center.

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