Adsorption of azoxystrobin and pyraclostrobin onto degradable and non-degradable microplastics: Performance and mechanism.

IF 8.2 1区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Science of the Total Environment Pub Date : 2024-02-20 Epub Date: 2023-12-21 DOI:10.1016/j.scitotenv.2023.169453

Yuyan Li, Dawei Zhen, Fengmao Liu, Xianzhao Zhang, Zhiqiang Gao, Jun Wang

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Abstract

Microplastics (MPs) exist after agricultural operations and thus present potential hazards to the environment and human health. However, the ecological risks posed by MPs carrying pesticides remain unclear. In this study, the adsorption and desorption behaviors of two pesticides, azoxystrobin and pyraclostrobin, on degradable and non-degradable MPs of poly(butylene adipate-co-terephthalate) (PBAT) and polyethylene (PE) were compared before and after UV aging. Additionally, the bioaccessibility of MPs carrying pesticides within a condition simulating gastrointestinal fluids was evaluated. The results showed that, after UV aging, the adsorption capacity of PBAT for pesticides decreased, while that of PE increased. Moreover, PBAT possessed higher adsorption ability towards both the pesticides due to its higher specific surface area, pore volume, contact angle, and lower crystallinity, as well as stronger van der Waals forces, electrostatic interactions, and hydrogen bonding indicated by theoretical calculation. Bioaccessibility experiments showed that azoxystrobin and pyraclostrobin had a higher risk of desorption from PBAT than PE, which is mainly dependent on the LogKow of pesticides according to the random forest analysis. In brief, the study highlights the potential risks of degradable MPs carrying pesticides to human health and the ecosystem, especially when compared to their non-degradable counterparts, manifesting that the ecological risk posed by degradable MPs should not be ignored.

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可降解和不可降解微塑料对唑氧菌酯和吡唑醚菌酯的吸附：性能和机理。

微塑料（MPs）存在于农业作业之后，因此对环境和人类健康具有潜在危害。然而，携带农药的微塑料对生态造成的风险仍不清楚。本研究比较了两种农药唑啉草酯和吡唑醚菌酯在聚对苯二甲酸丁二醇酯（PBAT）和聚乙烯（PE）的可降解和不可降解 MPs 上紫外线老化前后的吸附和解吸行为。此外，还在模拟胃肠液的条件下评估了携带农药的 MPs 的生物可及性。结果表明，紫外线老化后，PBAT 对农药的吸附能力下降，而 PE 的吸附能力上升。此外，PBAT 具有更高的比表面积、孔隙率、接触角和较低的结晶度，而且理论计算表明其范德华力、静电作用和氢键作用更强，因此对两种农药都具有更高的吸附能力。生物可吸附性实验表明，与 PE 相比，唑啉草酯和吡唑醚菌酯从 PBAT 中解吸附的风险更高，根据随机森林分析，这主要取决于农药的 LogKow。简而言之，该研究强调了携带农药的可降解多孔质材料对人类健康和生态系统的潜在风险，尤其是与不可降解多孔质材料相比，这表明可降解多孔质材料带来的生态风险不容忽视。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Science of the Total Environment 环境科学-环境科学

CiteScore

17.60

自引率

10.20%

发文量

8726

审稿时长

2.4 months

期刊介绍： The Science of the Total Environment is an international journal dedicated to scientific research on the environment and its interaction with humanity. It covers a wide range of disciplines and seeks to publish innovative, hypothesis-driven, and impactful research that explores the entire environment, including the atmosphere, lithosphere, hydrosphere, biosphere, and anthroposphere. The journal's updated Aims & Scope emphasizes the importance of interdisciplinary environmental research with broad impact. Priority is given to studies that advance fundamental understanding and explore the interconnectedness of multiple environmental spheres. Field studies are preferred, while laboratory experiments must demonstrate significant methodological advancements or mechanistic insights with direct relevance to the environment.