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- W3022492008 endingPage "139083" @default.
- W3022492008 startingPage "139083" @default.
- W3022492008 abstract "In natural environment, microplastics (MPs) undergo varying degrees of aging. It is believed that aged MPs show different surface properties and leaching behaviors from unaged ones. Here, the effects of aging on surface characteristics of TiO2-pigmented MPs and particle size distribution of TiO2 leached from MPs were systematically investigated. Experimental results show that the carbonyl index and color difference of MPs increased after aging. The increased carbonyl content in MPs was due to photo-oxidation, which further caused the fragility of MPs, the loss of TiO2 pigments and the formation of surface cracks. The decreased weight loss for aged MPs was due to the photo-transformation of LDPE into other compounds. Aged MPs could release more and faster TiO2 particles than unaged MPs, and aged MPs tended to release more large particles (>5 μm) and fewer small particles (<5 μm) than unaged MPs. Aged MPs released TiO2 with particle size uniformly distributed in each size fraction, but unaged MPs mainly released small particles (57.6%–86.2%). With increasing leaching time, the proportion of small particles leached from MPs especially aged MPs decreased and the proportion of large particles increased. These findings will help us better understand how aging process impacts the properties and leaching of MPs and the size distribution of particulate additives leached from MPs." @default.
- W3022492008 created "2020-05-13" @default.
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- W3022492008 date "2020-08-01" @default.
- W3022492008 modified "2023-10-16" @default.
- W3022492008 title "Weathering alters surface characteristic of TiO2-pigmented microplastics and particle size distribution of TiO2 released into water" @default.
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- W3022492008 doi "https://doi.org/10.1016/j.scitotenv.2020.139083" @default.
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