Summary
This comprehensive review examines UV-induced photoaging of microplastics as the dominant weathering mechanism in natural environments, synthesising mechanistic pathways from oxidative degradation to EPFR-mediated processes. The authors translate these mechanisms into measurable photoaging indices and critically assess biotoxicity, with particular emphasis on dissolved organic matter release as an underrecognised ecological stressor. The review advances understanding by linking microplastic photoaging with plastisphere formation and microbial colonisation, bridging degradation chemistry with environmental and ecological consequences.
UK applicability
As a mechanistic and environmental fate review, the findings are internationally applicable to UK environmental monitoring and microplastic risk assessment. UK-specific relevance would depend on integration of these photoaging mechanisms into environmental quality standards and agricultural/aquatic ecosystem monitoring protocols.
Key measures
Photoaging indices; UV-induced oxidative mechanisms; polymer-specific degradation pathways; environmentally persistent free radical (EPFR) formation; dissolved organic matter (DOM) release; surface property changes; microbial colonisation indicators
Outcomes reported
The study synthesised mechanistic understanding of UV-induced photoaging of microplastics, identifying factors governing polymer degradation and evaluated representative photoaging indices. It assessed biotoxicity of photoaged microplastics, particularly the release of dissolved organic matter and changes in surface properties affecting pollutant adsorption and microbial colonisation.
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