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Updated: Jun 5, 2025

Separation and Identification of Conventional Microplastics from Farmland Soils
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Microplastic analysis in soils: A comparative assessment.

Stoyana Peneva1, Quynh Nhu Phan Le2, Davi R Munhoz3

  • 1Wessling GmbH, AM Umweltpark 1, Bochum 44793, Germany; Institute of Crop Science and Resource Conservation (INRES), Soil Science and Soil Ecology, University of Bonn, Nussallee 13, Bonn 53115, Germany.

Ecotoxicology and Environmental Safety
|December 7, 2024
PubMed
Summary
This summary is machine-generated.

Comparing microplastic (MiP) quantification methods in soil reveals significant differences in accuracy and sensitivity based on plastic type and soil properties. Soxhlet extraction with 1H NMR spectroscopy is most effective for quantifying small biodegradable MiPs.

Keywords:
Conventional synthetic and biodegradable polymersSoil pollutionSpectroscopy

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Soil Science

Background:

  • Microplastic (MiP) contamination is a growing environmental concern.
  • Standardized methods for quantifying MiPs in diverse soil matrices are lacking.
  • Variability in quantification techniques hinders data harmonization and risk assessment.

Purpose of the Study:

  • To compare the efficacy of various analytical protocols for microplastic quantification in soil.
  • To evaluate different detection techniques (microscopy, spectroscopy, chromatography) coupled with extraction methods.
  • To assess method performance across different soil types and microplastic materials (including biodegradable plastics).

Main Methods:

  • Comparison of Digital, Fluorescence, FTIR, and Raman microscopy.
  • Evaluation of Pyrolysis-Gas Chromatography-Mass Spectroscopy (Py-GC-MS) and 1H NMR spectroscopy.
  • Testing protocols on three soil types with varying organic carbon and clay content, using large (0.5-1 mm) and small (20-250 µm) microplastics of various polymer types (HDPE, LDPE, PP, PS, PA, PET, PVC, PBAT/PLA).

Main Results:

  • Fluorescence microscopy showed high recovery rates (74-98%) for large microplastics.
  • Raman spectroscopy performance was affected by soil organic matter, requiring extensive pretreatment.
  • Soxhlet extraction combined with 1H NMR spectroscopy provided reliable quantification for small biodegradable microplastics (PBAT/PLA), which were missed by fluorescence microscopy.
  • Py-GC-MS exhibited intermediate results, with reduced sensitivity to plastic type and lower recovery in clay-rich soils.

Conclusions:

  • No single method is universally superior; method choice depends on microplastic type, size, and soil characteristics.
  • Direct comparisons of microplastic loads across different methodologies require careful consideration of their limitations.
  • Soxhlet extraction with 1H NMR is recommended for accurate quantification of small, biodegradable microplastics, crucial for setting future environmental thresholds.