Environmental Science & Technology, Journal Year: 2025, Volume and Issue: unknown
Published: March 8, 2025
The escalating environmental concern over secondary microplastics (SMPs) stems from their physicochemical evolution primary (PMPs), yet the contribution of varying transformations to ultimate risks remains unknown. In this study, a photomechanical degradation process was employed convert sunscreen-derived (SDMPs) into SDMPs. While mechanical caused physical fragmentation, photodegradation induced both and chemical alterations, introducing surface oxidation, bond scission, cross-linking Employing combination alkaline digestion pyrolysis GC-MS techniques, it observed that fragmentation photooxidation led heightened intracellular sequestration MPs. Although bioaccumulated SDMPs could be indicated by enlarged lysosomes fragmented mitochondria, toxicity at cellular level primarily driven post-photodegradation. A nontargeted analysis employing high-resolution mass spectrometry identified 46 plastic-associated compounds in leachate, with photodegradation-induced playing crucial role dissociation hydrophobic additives oxidative conversion leached compounds. leachate exacerbated photodegradation, mitochondrial serving as subcellular biomarker, indicative toxicity. This study elucidates pivotal augmenting cytotoxicity SDMPs, shedding light on intricate interplay between risks.
Language: Английский