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Mitchell M Schutte¹, Shimaa M Kteeba², Laodong Guo³

¹School of Freshwater Sciences, University of Wisconsin-Milwaukee, 600 E. Greenfield Ave., Milwaukee, WI 53204, USA; Milwaukee Metropolitan Sewerage District, 260 W. Seeboth Street, Milwaukee, WI 53204, USA.

The Science of the total environment

|November 22, 2023

概括

微塑料和微纤维在水环境中释放溶解有机物 (DOM),微纤维产生更多的DOM. 聚合物结构影响DOM生产和光化学反应,影响环境命运.

科学领域:

环境化学环境化学
聚合物科学聚合物科学
水生生态学水生生态学

背景情况:

塑料垃圾,包括微塑料 (MP) 和微纤维 (MF),是水生生态系统中普遍存在的污染物.
众议员和MF被认为是溶解有机物 (DOM) 的来源,但它们的形成途径和环境行为尚未得到充分理解.

研究的目的:

调查各种原始MP和MF的水溶性DOM的产量,特性和光化学反应性.
阐明聚合物化学结构对水生环境中DOM生产和降解的影响.

主要方法:

溶解有机碳 (DOC) 和染色体DOM (CDOM) 的量化来自7个MP和3个MF.
描述DOM属性,包括分子大小和Zeta潜力.
使用光光谱学评估光化学反应性和降解动力学.

主要成果:

微纤维通常表现出比微塑料更高的DOM产量.
聚合物成分显著影响了DOM产量,含有芳香的塑料 (PETE,PS) 和PVC显示了CDOM产量的增加.
DOM分子大小在60nm到937nm之间,主要是负Zeta电位.
对CDOM的光化学降解速率常数高于DOC,而PETE和PS衍生的DOM降解速度更快.

结论:

塑料衍生的DOM特性和产量强烈依赖于聚合物类型和结构.
微纤维对水生DOM有着显著的贡献.
了解塑料衍生DOM的光化学命运对于评估其在水生系统中的环境影响至关重要.

关键词:

降解动力学降解动力学溶解的有机物质是有机物质.环境的命运环境的命运微纤维是一种微纤维.微塑料是一种微塑料.光化学降解的降解方式

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