College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China; State Key Laboratory of Pollution Control and Resource Reuse, Shanghai 200092, PR China.
College of Environmental Science and Engineering, Tongji University, Shanghai 200092, PR China; State Key Laboratory of Pollution Control and Resource Reuse, Shanghai 200092, PR China.
Sci Total Environ. 2022 Apr 10;816:151598. doi: 10.1016/j.scitotenv.2021.151598. Epub 2021 Nov 12.
Organic components of microplastic leachates were investigated in an integrated non-targeted analysis study that included statistical analysis on leachates generated under different leaching scenarios. Leaching experiments were undertaken with simulated gastric fluid (SGF), river water, and seawater with common polymer types, including polyethylene, polypropylene, polyvinyl chloride, polyethylene terephthalate, and polyester fabrics comprising both raw and recycled materials. Totals of 111.0 ± 26.7, 98.5 ± 20.3, and 53.5 ± 4.7 different features were tentatively identified as compounds in SGF, freshwater, and seawater leachates, respectively, of which 5 compounds were confirmed by reference standards. The leaching capacities of the media were compared, and the clusters of structurally related features leached in the same medium were studied. For leachates generated from raw and recycled plastics, volcano plots and Pearson's Chi-squared tests were used to identify characteristic features. More characteristic features (3-20) had an average intensity across all recycled plastics that were significantly higher (p < 0.05) than that (1-3) of raw plastics under different conditions. The results indicate that gastric solution is more likely to leach components from microplastics, and there exists the difference of leachate's organic composition between raw and recycled materials, providing new insights into understanding microplastic environmental effects.
采用非靶向综合分析方法研究了微塑料浸出物的有机成分，其中包括对不同浸出情况下生成的浸出物进行统计分析。采用模拟胃液 (SGF)、河水和海水对包括聚乙烯、聚丙烯、聚氯乙烯、聚对苯二甲酸乙二醇酯和包含原生和再生材料的聚酯纤维在内的常见聚合物类型进行了浸出实验。在 SGF、淡水和海水中浸出物中分别暂定鉴定出 111.0 ± 26.7、98.5 ± 20.3 和 53.5 ± 4.7 种不同的特征化合物，其中 5 种化合物通过参比标准得到确认。比较了介质的浸出能力，并研究了在相同介质中浸出的结构相关特征化合物簇。对于由原生和再生塑料生成的浸出物，使用火山图和 Pearson's Chi-squared 检验来识别特征化合物。在所有再生塑料中，具有平均强度的特征化合物（3-20）明显高于（p < 0.05）不同条件下原生塑料的特征化合物（1-3）。结果表明，胃液更有可能从微塑料中浸出成分，并且原生和再生材料的浸出物有机组成存在差异，这为理解微塑料的环境影响提供了新的见解。
