海水
超纯水
微塑料
环境化学
氯
河口
化学
水溶液
环境科学
人工海水
环境工程
海洋学
有机化学
地质学
作者
Xiaowei Wu,Peng Liu,Hanyu Wang,Huiting Huang,Yanqi Shi,Cuiwei Yang,Shixiang Gao
出处
期刊:Water Research
[Elsevier]
日期:2021-09-01
卷期号:202: 117396-117396
被引量:90
标识
DOI:10.1016/j.watres.2021.117396
摘要
Photo aging of microplastics (MPs) in water environment are relevant to free radical associated polymer chain reaction, and various photo chemical reactive constitutes (i.e., Cl-, Br-, NO3-, CO32-, and natural organic matters) would affect the reaction, leading to a great difference in the photo aging mechanism of MPs between freshwater and seawater system. This study investigated light induced photo aging process of polypropylene (PP) MPs in ultrapure water, estuary water, and seawater. Results revealed that the aging rate of PP MPs was significantly decreased in estuary water and seawater compared with that in ultrapure water, leading to a longer resistance time after emission in marine environment. Besides, lower carbonyl index was found with the increased aqueous Cl- concentration, highlighting the important role of Cl- in the inhibitory effect for PP MPs aging process in seawater. This is due to the formation of Cl2•- in seawater which could react with HO2• and prevent the formation of O2•-, thus inhibit the photo aging process of PP MPs under light irradiation. The finding in this study clearly indicates the impact of the water matrices on the photo aging rate of MPs in natural water.
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