UV-Irradiation Facilitating Pb Release from Recycled PVC Microplastics

被引：0
作者：
Junxiang Ren
Tongliang Wu
Cun Liu
Peixin Cui
Fei Dang
Qiang Yang
Yujun Wang
机构：
[1] Chinese Academy of Sciences,Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science
[2] University of Chinese Academy of Sciences,undefined
来源：
Bulletin of Environmental Contamination and Toxicology | 2021年 / 107卷
关键词：
Microplastics; Recycled PVC; Pb; UV-irradiation; Hydroxyl radical;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
Microplastics (MPs) are ubiquitously in ecosystem and have evoked wide attention. The potential risk of MPs to the ecosystems is associated with MPs and the additives such as Pb, which serves as a traditional stabilizer. However, the release of Pb from MPs remains largely unknown. In this study, we evaluated the release of Pb from recycled polyvinyl chloride (PVC) under UV-irradiation. The release process was dominated by two processes: H+ facilitated dissolution of Pb, and light-induced hydroxyl radical (·OH) caused C–H bond cleavage from PVC with the generation of alkyl radical. The effects of pH and coexisting low molecular weight organic acids (LMWOAs) were also evaluated. Lower pH speeds up the Pb release from MPs. The LMWOAs act as a filter of UV to restrain the Pb release. Overall, this study shows the release of Pb from recycled PVC MPs and indicates the potential risk of Pb to the environment.
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页码：748 / 753
页数：5
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