不同粒径PS-MNPs对铜绿微囊藻的毒理效应

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中图分类号：X5 文献标志码：A 文章编号：1002-4026（2025）04-0095-11

Abstract： Micro/nanoplastics（MNPs）and microalgae are widely distributed in waterand MNPs that adhere to the surfaceof microalgaeorentertheirinternal structureswillenter thefoodchaininlargequantities，posinga greatthreat to aquatic ecosystems.The physiological efectsof MNPsonalgaevarydepending on their particle sizes.Inthis study， polystyrene micro/nanoplastics（PS-MNPs）particles wereselectedas target polutants toinvestigate their toxicological effects on Microcystis aeruginosa （FACHB 905） at diferent concentrations（5，10，50 and 250mg/L ）and particle sizes （ 100μm and ）.Results showed that the inhibition effect of PS-MNPs exerted a more potent inhibitory effect on the growth of algal，chlorophyll a and phycobiliprotein synthesis than 100μm PS-MNPs，and the inhibitory effect was more obvious withthe increase of PSconcentration.Inaddition，theactivities ofcatalase（CAT），malondialdehyde dehydrogenase（MDA）and glutathione（GSH）inmicroalgae cells were significantly increased under the stress of high concentrationof PS-MNPs，indicating that high concentrationof PS-MNPscausedoxidative damage toalgal cels，and smaler PS-MNPsparticlescan lead tomore severe oxidative damage.The toxicityofPS-MNPs withdiferent particle sizes toward M.aeruviosa mainlyledtocelldestruction through surfaceadsorption，which affcted photosynthesis and energy metabolismof algalcels，hindering normalphysiologicalandbiochemicalreactionsinalgalcels.Thisstudy，byexploring the toxicity mechanismofPS-MNPs tomicrocystisaeruginosa，isof great significancefortherisk assessmentofPS-MNPs， and provides a theoretical basis for the prevention of M.aeruginosa bloom.

Key words ∵ micro/nanoplastics； polystyrene；Microcystis aeruginosa； toxicological effects

塑料因具有便利性、稳定性、耐用性、经济性等在许多领域被广泛使用，年产量持续增长，2022年全球塑料的产量已达到4亿吨。（剩余18750字）