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Updated: Sep 8, 2025

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Photodegradation of PET plastics produces persistent compounds that accumulate in sediments.

Eonjin Hwang1, Raees Ahmad2, Imran Shafique2

  • 1Department of Chemistry, Kyungpook National University, Daegu 41566, Republic of Korea; Material Analysis Center, Korea Dyeing & Finishing Technology Institute, Daegu, 41706, Republic of Korea.

Marine Pollution Bulletin
|September 6, 2025
PubMed
Summary

This study identifies overlooked polar byproducts from Polyethylene terephthalate (PET) photodegradation in marine environments. These water-soluble compounds are released into oceans, posing a potential risk to marine ecosystems.

Keywords:
Marine pollutionMicroplasticsPhotodegradationPolyethylene terephthalateToxicity Assessment

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Area of Science:

  • Environmental Chemistry
  • Polymer Science
  • Marine Pollution Studies

Background:

  • Polyethylene terephthalate (PET) is a ubiquitous plastic with low recycling rates, leading to significant environmental accumulation.
  • PET waste pollutes marine ecosystems through landfilling, incineration, and direct discharge.
  • Photodegradation of PET generates lower-molecular-weight compounds, with a focus on microplastics, neglecting water-soluble products.

Purpose of the Study:

  • To investigate the polar, water-soluble degradation products of Polyethylene terephthalate (PET) under simulated marine photodegradation conditions.
  • To quantify the potential global release of these identified PET degradation products.
  • To detect and confirm the presence of PET-derived degradation products in real marine environmental samples.

Main Methods:

  • Simulated PET photodegradation under controlled marine-like conditions.
  • Analysis of degradation products using ultra-high-performance liquid chromatography coupled with high-resolution mass spectrometry (UHPLC-HRMS).
  • Confirmation of identified compounds using authentic standards and targeted environmental analysis of marine sediments.

Main Results:

  • Seventeen PET degradation products were identified, with five confirmed using authentic standards.
  • Laboratory simulations estimated a global annual release of 1 to 5.5 tons of these polar compounds.
  • PET-derived degradation products were detected in marine sediments from Ganggu Port, South Korea.

Conclusions:

  • Photodegradation of PET releases significant amounts of overlooked polar, water-soluble compounds into marine environments.
  • These compounds possess high mobility and bioavailability, indicating potential for widespread environmental distribution and impact.
  • The findings underscore the importance of considering these polar byproducts in the assessment of plastic pollution and its ecological risks.