从聚烯微塑料中提取的溶解有机物中的分子特性和塑料添加剂:累积辐射和微塑料度的影响
Yuanyuan Cao1, Yang Liu1, Kehui Guo2
1Key Laboratory of Groundwater Conservation of MWR, Key Laboratory of Groundwater Circulation and Environmental Evolution of MOE, School of Water Resources and Environment, China University of Geosciences Beijing, Beijing, 100083, China.
Water research
|April 20, 2025
概括
累积辐射显著加快了微塑料的老化和微塑料衍生的溶解有机物 (MP-DOM) 的释放. 低度的微塑料 (MPs) 增加了MP-DOM的浸和可降解性,影响水生生态系统.
科学领域:
- 环境科学 环境科学
- 环境化学环境化学
- 聚合物科学 聚合物科学
背景情况:
- 微塑料衍生溶解有机物 (MP-DOM) 是微塑料 (MPs) 尚未研究的环境影响.
- 辐射强度对MP-DOM释放和分子组成 (包括塑料添加剂) 的影响尚不清楚.
- 了解MP老化和MP-DOM形成对于评估生态风险至关重要.
研究的目的:
- 研究累积辐射和微塑料度对聚乙烯衍生溶解有机物 (PS-DOM) 的释放和分子多样性的影响.
- 描述PS-DOM组合,包括氧化产品和塑料添加剂.
- 为了确定累积辐射触发显著PS-DOM漏的门.
主要方法:
- 在不同累积辐射和度 (1-5 g/L) 下模拟聚烯微塑料 (PS-MPs) 的光衰老.
- 使用光谱学,FT-ICR MS 和LC-HRMS进行PS-DOM的表征.
- 水后的PS-DOM,氧化产品和塑料添加剂的量化.
主要成果:
- 累积辐射显著加快了PS-MPs老化和PS-DOM漏,观察到的值效应约为75kWh/m2.
- 与天然有机物相比,PS-DOM包含30.1%-31.8%的独特成分,并且在较低的PS-MP度下显示出更大的降解性.
- 在PS-DOM中,LC-HRMS确定了13种氧化产品和25种塑料添加剂,在PS-MP度较高时,数量会下降.
结论:
- 累积辐射是驱动MP-DOM漏和改变其分子组成的关键因素.
- 较低的微塑料度加剧了每单位质量的浸出和可降解性,增加了塑料添加剂的释放.
- 这项研究为水生系统中MP-DOM相关的环境风险提供了关键的见解.
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