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  11. Freeze-thaw Aged Polyethylene And Polypropylene Microplastics Alter Enzyme Activity And Microbial Community Composition In Soil

Freeze-thaw aged polyethylene and polypropylene microplastics alter enzyme activity and microbial community composition in soil

Yanjun Li1, Guanghui Xu2, Yong Yu2

  • 1Key Laboratory of Wetland Ecology and Environment, State Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China; University of Chinese Academy of Sciences, Beijing 100049, China.

Journal of Hazardous Materials
|April 11, 2024

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View abstract on PubMed

Summary
This summary is machine-generated.

Freeze-thaw cycles alter microplastics (MPs) in cold region soils, affecting soil enzyme activity and microbial community structure. Polypropylene MPs, in particular, show potential for pollutant degradation despite altering soil processes.

Area of Science:

  • Environmental Science
  • Soil Science
  • Ecotoxicology

Background:

  • Microplastics (MPs) are persistent pollutants in cold region soils.
  • The effects of freeze-thaw (FT) aging on soil-bound MPs and their ecological impacts remain largely unknown.

Purpose of the Study:

  • To investigate the influence of FT-aged MPs on soil physico-chemical properties and microbial communities.
  • To assess the impact of different MP types (polyethylene and polypropylene) and sizes (50 and 500 µm) on soil health after FT aging.

Main Methods:

  • Soil samples treated with environmentally relevant concentrations of MPs were subjected to 45-day freeze-thaw cycles (FTCs).
  • Changes in MP surface morphology, hydrophobicity, and crystallinity were analyzed.
  • Soil urease (SUE) activity and microbial community structure (Shannon index, network complexity) were measured.
Keywords:
Freeze-thaw agingMicrobial communityPolyethylene microplasticsPolypropylene microplastics

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Main Results:

  • FTCs altered MP surface morphology, hydrophobicity, and crystallinity.
  • Soil urease activity varied significantly, with 500 µm PE and PP MPs increasing activity compared to controls.
  • Microbial community analysis revealed increased network complexity and specific bacterial biomarkers associated with pollutant degradation in aged PP-MPs.

Conclusions:

  • FT-aged MPs, particularly polypropylene, can alter soil enzyme activity and microbial community structure in cold regions.
  • Aged PP-MPs may play a role in pollutant degradation but also disrupt soil metabolic processes.
  • This study highlights the potential ecological risks of MPs in cold soil environments after freeze-thaw aging.
Soil