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Updated: Nov 23, 2025

Forming Micro-and Nano-Plastics from Agricultural Plastic Films for Employment in Fundamental Research Studies
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Plastic pollution - A case study with Enchytraeus crypticus - From micro-to nanoplastics.

Mónica J B Amorim1, Janeck J Scott-Fordsmand2

  • 1Department of Biology & CESAM, University of Aveiro, Aveiro, 3810-193, Portugal.

Environmental Pollution (Barking, Essex : 1987)
|January 1, 2021
PubMed
Summary

Microplastics fragment into nanoplastics, posing a greater cellular uptake risk. Standard environmental hazard tests are insufficient, necessitating extended durations and focus on nano-polymers in terrestrial ecosystems.

Keywords:
BioaccumulativeNano-enabled-productsNanoplasticsOECD extensionOECD standardizationPersistentToxic (PBT) or very persistent and very bioaccumulative (vPvB) substances

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Area of Science:

  • Environmental Science
  • Toxicology
  • Materials Science

Background:

  • Microplastic pollution is a growing concern, but its fragmentation into nanoplastics presents a more significant threat due to increased cellular uptake.
  • Nanoplastics can release embedded materials, potentially increasing their toxicity.
  • Current standard tests may not adequately assess the risks associated with nanoplastics and aged materials.

Purpose of the Study:

  • To evaluate the environmental hazards of nanoplastics and fragmented polymers using terrestrial invertebrate models.
  • To assess the suitability of standard OECD/ISO in vivo hazard tests for nanoplastics.
  • To investigate the impact of extended exposure durations on nanoplastic toxicity.

Main Methods:

  • Conducted 25 OECD/ISO in vivo hazard tests using the terrestrial invertebrate Enchytraeus crypticus.
  • Utilized pristine nano-scale materials (NMs), fragmented polymers with embedded NMs (FP_NM), and fragmented polymers without NMs (FP).
  • Included extended exposure durations (60 days) beyond the standard 28-day test period.

Main Results:

  • Extended exposure (60 days) revealed significant population decrease for multi-walled carbon nanotubes (MWCNTs), undetected in standard 28-day tests.
  • Fragmented polymers, particularly those with embedded NMs, showed varying degrees of toxicity.
  • Standard test durations were found to be inadequate for assessing the full hazard of nanoplastics and aged materials.

Conclusions:

  • Standard ecotoxicity tests are insufficient for evaluating nanoplastic hazards.
  • Weathering and aging of materials should be considered in hazard assessments.
  • Extended test durations and a focus on nano-polymers in terrestrial environments are crucial for accurate risk evaluation.