Effect of Polymer Aging on Uptake/Release Kinetics of Metal Ions and Organic Molecules by Micro- and Nanoplastics: Implications for the Bioavailability of the Associated Compounds,Environmental Science & Technology

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Effect of Polymer Aging on Uptake/Release Kinetics of Metal Ions and Organic Molecules by Micro- and Nanoplastics: Implications for the Bioavailability of the Associated Compounds
Environmental Science & Technology ( IF 10.8 ) Pub Date : 2023-10-19 , DOI: 10.1021/acs.est.3c05148
Raewyn M Town ₁ , Herman P van Leeuwen _{1,

2} , Jérôme F L Duval ₃

Affiliation

The main driver of the potential toxicity of micro- and nanoplastics toward biota is often the release of compounds initially present in the plastic, i.e., polymer additives, as well as environmentally acquired metals and/or organic contaminants. Plastic particles degrade in the environment via various mechanisms and at different rates depending on the particle size/geometry, polymer type, and the prevailing physical and chemical conditions. The rate and extent of polymer degradation have obvious consequences for the uptake/release kinetics and, thus, the bioavailability of compounds associated with plastic particles. Herein, we develop a theoretical framework to describe the uptake and release kinetics of metal ions and organic compounds by plastic particles and apply it to the analysis of experimental data for pristine and aged micro- and nanoplastics. In particular, we elucidate the contribution of transient processes to the overall kinetics of plastic reactivity toward aquatic contaminants and demonstrate the paramount importance of intraparticulate contaminant diffusion.

中文翻译：

聚合物老化对微米和纳米塑料吸收/释放金属离子和有机分子动力学的影响：对相关化合物生物利用度的影响

微塑料和纳米塑料对生物群的潜在毒性的主要驱动因素通常是塑料中最初存在的化合物（即聚合物添加剂）以及环境中获得的金属和/或有机污染物的释放。塑料颗粒在环境中通过各种机制以不同的速率降解，具体取决于颗粒尺寸/几何形状、聚合物类型以及主要的物理和化学条件。聚合物降解的速率和程度对吸收/释放动力学具有明显的影响，从而影响与塑料颗粒相关的化合物的生物利用度。在此，我们开发了一个理论框架来描述塑料颗粒吸收和释放金属离子和有机化合物的动力学，并将其应用于原始和老化的微米和纳米塑料的实验数据分析。特别是，我们阐明了瞬态过程对水生污染物塑料反应性整体动力学的贡献，并证明了颗粒内污染物扩散的至关重要性。

更新日期：2023-10-19

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