微塑料
邻苯二甲酸盐
增塑剂
邻苯二甲酸二丁酯
邻苯二甲酸二乙酯
化学
浸出(土壤学)
聚氯乙烯
环境化学
吸附
毒性特征浸出程序
腐植酸
有机化学
土壤水分
重金属
肥料
土壤科学
环境科学
作者
Yuanyuan Yan,Fengxiao Zhu,Changyin Zhu,Zhanghao Chen,Shaochong Liu,Chao Wang,Cheng Gu
出处
期刊:Water Research
[Elsevier]
日期:2021-10-01
卷期号:204: 117597-117597
被引量:100
标识
DOI:10.1016/j.watres.2021.117597
摘要
In recent years, great efforts have been made to understand the capacity of microplastics to adsorb environmental pollutants; however, relatively little is known about the ability of microplastics to release inherent additives into peripheral environments. In this study, we investigated the leaching behavior of phthalate plasticizer from polyvinyl chloride (PVC) microplastics, in aqueous solutions relevant to aquatic and soil environments. It was found that plastic properties, such as particle size, plasticizer content and aging of plastics had a great effect on the leaching of dibutyl phthalate (DnBP). Phthalate release was generally higher in smaller particles and particles with higher phthalate content. Whereas, plastic aging caused by solar irradiation could either enhance phthalate release by increasing plastic hydrophilicity or decrease the leaching by reducing readily available fractions of phthalate. Regarding environmental factors, solution pH (3–9) and ionic strength (0–0.2 M NaCl) were found to have minor effect on phthalate release, while fulvic acid (0–200 mg/L) greatly promoted the release by improving phthalate solubility and solution-plastic affinity. Interestingly, we found that more DnBP was leached out when fulvic acid and NaCl coexisted, and the results from dissolved organic carbon (DOC) and three-dimensional fluorescence spectroscopy analyzes suggested that the leaching of other fulvic acid-like additives might have played a role. These findings would be helpful for predicting the potential of microplastics to release toxic additives under different environmental conditions.
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