Microplastics in agricultural soils following sewage sludge applications: Evidence from a 25-year study
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View abstract on PubMed
Summary
This summary is machine-generated.Sewage sludge application significantly increases microplastics in agricultural soils, with abundance remaining constant for over 22 years. Degradation of some microplastics may create smaller particles, and colored microfibers pose environmental risks.
Area Of Science
- Environmental Science
- Soil Science
- Ecotoxicology
Background
- Sewage sludges are a known source of microplastic pollution in agricultural soils.
- Limited data exists on the long-term accumulation, persistence, and degradation of microplastics in soil ecosystems.
Purpose Of The Study
- To provide the first long-term, high temporal resolution quantitative evidence of microplastics in agricultural soils after sewage sludge application.
- To assess the abundance, persistence, and degradation of microplastics over a 25-year period.
Main Methods
- Biennial soil sampling over 25 years from an experimental field treated with five different sewage sludges.
- Analysis of microplastic abundance, composition, and degradation patterns.
- Utilizing plastic composition for source tracing.
Main Results
- Microplastic abundance increased by 723-1445% post-sludge application and remained constant for at least 22 years.
- White/transparent microfibers were the predominant type added by sludges.
- Microfibers, films, and fragments showed susceptibility to degradation, potentially forming micro(nano)plastics.
- Discoloration of colored microfibers was observed, indicating potential dye toxicity.
Conclusions
- Sewage sludge application leads to persistent microplastic contamination in agricultural soils.
- Microplastic degradation can produce smaller particles, and colored microfibers may pose ecological risks due to dye toxicity.
- Plastic composition analysis can trace microplastic sources, informing sludge management and risk assessment.
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