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[Aging Mechanism and Release Characteristics of Dissolved Substances of Polypropylene Microplastics Under the Combined Action of Light and Freeze-thaw Cycles].
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Scientists studied how sunlight and repeated freezing-and-thawing (like what happens in cold climates) break down common plastic (polypropylene) into smaller pieces called nanoplastics. They found that sunlight alone caused plastic to break into more, smaller nanoplastic particles over time, while freezing and thawing actually had the opposite effect, producing fewer but larger particles. This matters because it shows that how plastic breaks down—and how tiny the resulting particles get—depends heavily on climate conditions, which affects how much of these particles might end up in our water, soil, and eventually our bodies.
， respectively. Under light conditions， the abundance of nanoplastics increased with time， and the particle size decreased with time. Under freeze-thaw and combined treatments， the abundance of nanoplastics decreased， and the particle size increased. This study can provide a theoretical basis for clarifying the environmental effects and aging mechanisms of microplastics in cold regions.
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