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Related Experiment Video

Updated: Aug 2, 2025

Protocol for Microplastics Sampling on the Sea Surface and Sample Analysis
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Characterisation of microplastics is key for reliable data interpretation.

Diana S Moura1, Carlos J Pestana1, Colin F Moffat1

  • 1School of Pharmacy and Life Sciences, Robert Gordon University, Aberdeen, AB10 7GJ, UK.

Chemosphere
|April 19, 2023
PubMed
Summary

Characterizing microplastics is crucial for accurate aquatic research. This study found inconsistencies in commercially supplied microplastics, highlighting the need for thorough material analysis before experiments.

Keywords:
Grafting agentPlastic characterisationPlastic particle sizePlastic-pollutionPolymer

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Area of Science:

  • Environmental Science
  • Materials Science
  • Analytical Chemistry

Background:

  • Microplastic contamination in aquatic environments is a growing concern.
  • Laboratory studies often use microplastics without sufficient characterization.
  • Accurate microplastic data is vital for understanding environmental impacts.

Purpose of the Study:

  • To evaluate the characterization of microplastics in published adsorption studies.
  • To perform detailed characterization of commercially sourced microplastic particles.
  • To identify inconsistencies between supplier information and actual material properties.

Main Methods:

  • Analysis of 21 published microplastic adsorption studies.
  • Acquisition of six types of commercially available microplastics (small and large sizes).
  • Comprehensive material characterization using FT-IR, XRD, DSC, SEM, particle size analysis, and BET surface area analysis.

Main Results:

  • Significant inconsistencies were found between supplier-provided data and obtained analytical results for microplastic size and polymer composition.
  • Fourier transform infrared spectroscopy (FT-IR) revealed oxidation or grafting agents on small polypropylene particles, absent in larger ones.
  • Observed wide size variations in small microplastics (e.g., polyethylene 0.2-549 μm) and differing crystallinity in polyamide particles (small: semi-crystalline, large: amorphous).

Conclusions:

  • Thorough characterization of microplastics used in research is critical for reliable results.
  • Inconsistencies in microplastic properties can affect adsorption of pollutants and ecological impact assessments.
  • Standardized characterization protocols are needed to ensure the validity of microplastic research.