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Protocol for Microplastics Sampling on the Sea Surface and Sample Analysis

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Shape analysis of microplastic fragments: A computed microtomography study.

A P Teles¹, D F Oliveira², R T Lopes²

¹Nuclear Engineering Program, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil; Federal Institute of Paraná, Pinhais, Brazil.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine

|October 8, 2025

Summary

X-ray microtomography (microCT) offers new insights into microplastic (MP) characterization. This technique reveals diverse fragment shapes and internal degradation, crucial for understanding MP pollution.

Keywords:

Microplastic Microtomography Pollution Shape characterization

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Three-Dimensional Particle Shape Analysis Using X-ray Computed Tomography: Experimental Procedure and Analysis Algorithms for Metal Powders

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Published on: December 4, 2020

Area of Science:

Environmental Science
Materials Science
Analytical Chemistry

Background:

Microplastic (MP) pollution is a significant global environmental issue.
Comprehensive characterization of MP fragments is lacking.
Understanding MP morphology and degradation is crucial for assessing environmental impact.

Purpose of the Study:

To evaluate the utility of X-ray microtomography (microCT) for characterizing microplastic fragments.
To analyze the morphology and internal structures of Polyethylene Terephthalate (PET) microplastics.
To explore advanced imaging and processing techniques for microplastic analysis.

Main Methods:

Analysis of five secondary Polyethylene Terephthalate (PET) fragments (approx. 2.0 mm).
Optimization of microCT scanning parameters to achieve a 6.0 μm voxel size.
Application of advanced image processing for visualization of low-density materials.
Morphometric analysis using elongation, flatness, and sphericity.

Main Results:

MicroCT successfully visualized the complex morphology of irregular PET fragments.
Significant morphological diversity was observed among the analyzed fragments.
Internal structures, including cracks indicative of degradation, were identified.
A multi-parameter approach is necessary for effective microplastic classification.

Conclusions:

MicroCT is a powerful tool for detailed microplastic characterization.
The study highlights the morphological diversity and degradation potential of microplastics.
Further research is needed to refine classification methods and understand MP formation/degradation.