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Updated: Nov 11, 2025

Separation and Identification of Conventional Microplastics from Farmland Soils

Separation and Identification of Conventional Microplastics from Farmland Soils

Published on: March 21, 2025

Quantification of Microplastics in Soils Using Accelerated Solvent Extraction: Comparison with a Visual Sorting

Dishi Wen¹, Yiyang Chen¹, Yazhi Tong¹

¹Zhejiang Provincial Key Laboratory of Soil Contamination Bioremediation, School of Environment and Resources, Zhejiang Agriculture and Forestry University, Hangzhou, 311300, China.

Bulletin of Environmental Contamination and Toxicology

|March 25, 2021

Summary

Accelerated solvent extraction (ASE) effectively quantifies small microplastics in soil, overcoming visual sorting limitations. This method shows high recovery rates for common polymers, offering a reliable alternative for microplastic analysis.

Keywords:

Accelerated solvent extraction Microplastics Plastic polymers Quantification Soils

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Area of Science:

Environmental Science
Analytical Chemistry

Background:

Visual sorting is a common microplastic analysis technique but struggles with small particle quantification.
Accelerated Solvent Extraction (ASE) is typically used for organic contaminant analysis in soils and sediments.

Purpose of the Study:

To evaluate Accelerated Solvent Extraction (ASE) for microplastic quantification in soil samples.
To compare the effectiveness of ASE with traditional visual sorting methods.

Main Methods:

Recovery experiments were performed using spiked polymeric microplastics (polyethylene, polypropylene, polystyrene).
ASE was applied to agricultural soil samples from long-term plastic film mulching.
Fourier transform infrared spectroscopy (FTIR) was used to identify polyethylene in ASE extracts.

Main Results:

ASE demonstrated high recovery rates and low matrix effects for low-density, low-melting point polymers.
ASE effectively quantified microplastics in farmland soil samples.
Results from ASE on small samples (3.0 g) closely agreed with visual sorting data.

Conclusions:

Accelerated Solvent Extraction (ASE) is a viable and efficient method for microplastic quantification in agricultural soils.
ASE offers an improvement over visual sorting, particularly for smaller microplastic particles.
The combination of ASE and FTIR provides a robust approach for microplastic analysis in environmental matrices.