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Extracting and characterizing microplastics and nanoplastics from environmental samples.

Nana Liu1,2, Zifu Li3, Shikun Cheng4

  • 1School of Energy and Environmental Engineering, Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, University of Science and Technology Beijing, Beijing, People's Republic of China.

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Summary

This study presents a standardized workflow for extracting and characterizing microplastics and nanoplastics (MNPs) from environmental samples. The four-step extraction method (FSEM) ensures high recovery and purity for accurate MNP analysis.

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Area of Science:

  • Environmental Science
  • Analytical Chemistry
  • Materials Science

Background:

  • Measuring microplastics and nanoplastics (MNPs) is challenging due to varied extraction and characterization methods.
  • Inconsistent techniques hinder the comparability of MNP environmental studies.

Purpose of the Study:

  • To establish a standardized workflow for MNP preprocessing, extraction, and characterization.
  • To improve the reliability and comparability of MNP analysis in environmental matrices.

Main Methods:

  • A four-step extraction method (FSEM) involving predigestion, predensity separation, postdigestion, and postdensity separation.
  • Guidance on using analytical techniques like ATR-FTIR, LDIR, and O-PTIR for MNP characterization (0.5-5,000 µm).
  • Optimization advice for sample preparation based on matrix complexity and analysis goals.

Main Results:

  • The FSEM achieved high recovery rates (83.7%-100%) for common polymers.
  • The workflow minimizes artefactual changes, maximizing particle purity.
  • Experimental details for micro-FTIR analysis of microplastics >10 µm are provided.

Conclusions:

  • The presented workflow offers a reliable and reproducible method for MNP analysis.
  • Standardized protocols are crucial for advancing MNP research and environmental monitoring.
  • The workflow is accessible to environmental researchers, technicians, and students with appropriate equipment.