Copper Adsorption to Microplastics and Natural Particles in Seawater: A Comparison of Kinetics, Isotherms, and Bioavailability,Environmental Science & Technology

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Copper Adsorption to Microplastics and Natural Particles in Seawater: A Comparison of Kinetics, Isotherms, and Bioavailability
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2021-09-30 , DOI: 10.1021/acs.est.1c04278
Ciara Chun Chen _{1,

2,

3} , Xiaoshan Zhu ₃ , Huo Xu ₁ , Fengyuan Chen ₁ , Jie Ma ₁ , Ke Pan ₁

Affiliation

The growing use of plastics has led to microplastics (MPs) being ubiquitously distributed in marine environments. Although previous studies have emphasized MPs as important metal-transport vectors, few have considered the differences between these anthropogenic particles and their coexisting natural counterparts in sequestering metals in seawater. Here, we compared Cu adsorption to pristine and naturally aged MPs (polystyrene and polyethylene) with that to algae particles and sediments and assessed the bioavailability of the adsorbed Cu by a gut juice extraction assay. Adsorption kinetics and isotherms consistently showed that natural particles bound far more Cu to their surfaces than MPs. The rougher surfaces, greater specific surface areas, and lower ζ-potentials of natural particles contributed to their stronger Cu adsorption capacity than pristine or aged MPs. Natural particles also contained more diverse functional groups for binding Cu, with oxygen-containing groups playing a dominant role. Adsorbed Cu on natural particles was less extractable by sipunculan gut juice than that on MPs, indicating their higher Cu affinity. Overall, our study suggests that natural particles outcompete MPs in carrying metals in the water column and transferring them to marine organisms in today’s environmental context. This work provides new insights for assessing the risks of MPs in marine environments.

中文翻译：

海水中微塑料和天然颗粒对铜的吸附：动力学、等温线和生物利用度的比较

塑料使用量的增加导致微塑料 (MPs) 无处不在地分布在海洋环境中。尽管之前的研究强调 MPs 作为重要的金属运输载体，但很少有人考虑这些人为颗粒与其共存的天然颗粒在海水中螯合金属的差异。在这里，我们将 Cu 对原始和自然老化 MP（聚苯乙烯和聚乙烯）的吸附与藻类颗粒和沉积物的 Cu 吸附进行了比较，并通过肠液提取试验评估了吸附的 Cu 的生物利用度。吸附动力学和等温线一致表明，与 MPs 相比，天然颗粒在其表面结合的 Cu 多得多。更粗糙的表面，更大的比表面积，与原始或老化的 MP 相比，天然颗粒的较低 ζ 电位有助于它们对铜的吸附能力更强。天然颗粒还包含更多不同的用于结合 Cu 的官能团，其中含氧基团起主导作用。天然颗粒上吸附的 Cu 被 sipunculan 肠液提取的程度低于 MPs，表明它们具有更高的 Cu 亲和力。总体而言，我们的研究表明，在当今的环境背景下，天然颗粒在水柱中携带金属并将其转移到海洋生物方面胜过 MP。这项工作为评估海洋环境中 MP 的风险提供了新的见解。天然颗粒上吸附的 Cu 被 sipunculan 肠液提取的程度低于 MPs，表明它们具有更高的 Cu 亲和力。总体而言，我们的研究表明，在当今的环境背景下，天然颗粒在水柱中携带金属并将其转移到海洋生物方面胜过 MP。这项工作为评估海洋环境中 MP 的风险提供了新的见解。天然颗粒上吸附的 Cu 被 sipunculan 肠液提取的程度低于 MPs，表明它们具有更高的 Cu 亲和力。总体而言，我们的研究表明，在当今的环境背景下，天然颗粒在水柱中携带金属并将其转移到海洋生物方面胜过 MP。这项工作为评估海洋环境中 MP 的风险提供了新的见解。

更新日期：2021-10-19

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