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Microorganisms play a pivotal role in maintaining ecosystem balance by recycling essential elements such as carbon, nitrogen, and phosphorus, as well as supporting processes like bioremediation, wastewater treatment, and biofuel production.Microbes in Elemental CyclesIn the carbon cycle, microorganisms decompose organic matter, releasing carbon dioxide via aerobic respiration. This carbon dioxide is subsequently used by photosynthetic organisms to synthesize organic compounds, closing the...
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Related Experiment Video

Updated: Jan 16, 2026

Separation and Identification of Conventional Microplastics from Farmland Soils
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Spray paint-derived microplastics influence soil properties and microbial activity through their composite

Yaqi Xu1, Huiying Li1, Tingting Zhao1

  • 1Institute of Biology, Freie Universität Berlin, Altensteinstrasse 6, Berlin 14195, Germany; Berlin-Brandenburg Institute of Advanced Biodiversity Research (BBIB), Königin-Luise-Strasse 4-6, Berlin 14195, Germany.

Journal of Hazardous Materials
|October 1, 2025
PubMed
Summary

Paint-derived microplastics (MPs) impact soil health by altering pH and aggregate stability. Copper-containing MPs and specific additives pose significant ecological risks, highlighting the need for paint formulation transparency.

Keywords:
Heavy metal pigmentsPaint-derived microplasticsSoil pHSoil respirationWater-stable aggregates

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Area of Science:

  • Environmental Science
  • Soil Science
  • Ecotoxicology

Background:

  • Paint-derived microplastics (MPs) represent an emerging terrestrial pollutant.
  • Their ecological effects on soil health are not well understood.
  • Understanding these impacts is crucial for environmental risk assessment.

Purpose of the Study:

  • To investigate the ecological effects of paint-derived MPs on soil health.
  • To assess the influence of polymer composition, color, and concentration on these effects.
  • To identify specific components in paints that contribute to toxicity.

Main Methods:

  • Controlled six-week soil incubation experiment.
  • Application of paint-derived MPs from 10 commercial spray paints at 0.01% and 0.4% w/w.
  • Measurement of soil pH, water-stable aggregates, soil respiration, and key enzyme activities.

Main Results:

  • Paint-derived MPs increased soil pH and reinforced water-stable aggregates at high concentrations.
  • Different polymer compositions resulted in varied MP size distributions, affecting soil respiration.
  • Copper-containing MPs demonstrated significant negative impacts on all measured soil parameters.
  • Concentration-dependent toxicity was observed, linked to paint additives.

Conclusions:

  • Paint-derived MPs significantly alter soil properties and microbial activity.
  • Polymer composition, additives, and metal pigments (especially copper) are key determinants of ecological impact.
  • Increased transparency in paint formulations and regulation of hazardous components are essential.