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Related Experiment Video

Updated: Dec 23, 2025

Separation and Identification of Conventional Microplastics from Farmland Soils

Separation and Identification of Conventional Microplastics from Farmland Soils

Published on: March 21, 2025

Decrease in bioavailability of soil heavy metals caused by the presence of microplastics varies across aggregate

Hong Yu¹, Junhua Hou², Qiuling Dang²

¹College of Water Sciences, Beijing Normal University, Beijing, 100875, China; State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.

Journal of Hazardous Materials

|April 22, 2020

Summary

Microplastics alter soil heavy metal speciation, shifting metals from bioavailable to organic-bound forms. This transformation is more sensitive to long-term microplastic pollution in smaller soil aggregates.

Keywords:

Chemical speciation of metals Long-term incubation Polyethylene particles Response sensitive Soil fractionation

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Sampling and Identification of Microplastics in Groundwater

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Published on: November 7, 2025

Area of Science:

Environmental Science
Soil Science
Geochemistry

Background:

Microplastics (MPs) impact soil physicochemical and biogeochemical processes.
The effect of MPs on soil heavy metal speciation and its variation across soil aggregate levels is not well understood.

Purpose of the Study:

To investigate the influence of MPs on the chemical speciation of copper (Cu), chromium (Cr), and nickel (Ni) in different soil aggregate sizes.
To determine if MP effects on metal speciation differ across aggregate levels over time.

Main Methods:

Long-term soil culture experiments were conducted.
Soil fractionation techniques were used to analyze metal speciation.
Microplastics' effects on Cu, Cr, and Ni speciation in various soil aggregate sizes were assessed.

Main Results:

Microplastics reduced exchangeable, carbonate-bound, and Fe-Mn oxide-bound fractions of heavy metals.
Microplastics increased the organic-bound fractions of heavy metals.
The transformation of heavy metal speciation from bioavailable to organic-bound forms was promoted by microplastics, with notable differences across aggregate levels.

Conclusions:

Microplastics promote the transformation of soil heavy metal speciation towards organic-bound forms.
The sensitivity of this transformation to long-term microplastic pollution is greater in smaller soil aggregates than in larger ones due to a lag effect.