微塑料衍生的溶解有机物质在阳光照明的海水中的尺寸和结构依赖的分子指纹转化:对海洋碳循环的含义
Yan-Jun Liu1, Zhao Liang Chen1, Zekun Zhang1
1Department of Ocean Science and Center for Ocean Research in Hong Kong and Macau, The Hong Kong University of Science and Technology, Clear Water Bay, New Territories, Hong Kong 999077, China.
Environmental science & technology
|August 9, 2025
概括
微塑料的特性影响海洋中溶解有机物 (DOM) 的释放和转化. 这影响了海洋的碳循环,凸显了了解微塑料污染影响的必要性.
科学领域:
- 环境化学环境化学
- 海洋科学 海洋科学
- 聚合物科学 聚合物科学
背景情况:
- 微塑料 (MPs) 是普遍存在的海洋污染物,在紫外线照射时释放溶解有机物 (MPs-DOM).
- 对于MP-DOM光化学转化和海洋碳循环的影响,MP的内在特性对MP的影响尚不清楚.
研究的目的:
- 研究不同尺寸的聚乙烯 (PE) 和聚烯 (PP) 衍生的MP-DOM的时间动态.
- 阐明管理MPs-DOM转换的结构-反应关系.
- 评估MPs-DOM对海洋有机碳循环的潜在影响.
主要方法:
- 在阳光照明的海水中使用PE和PPMP进行了180天的人工气候试验.
- 使用光谱学和超高分辨率质谱学分析了MPs-DOM.
- 从不同类型和尺寸的塑料中比较MPs-DOM (∼250μm与∼5mm).
主要成果:
- 聚烯 (PP) 释放的MP-DOM比聚乙烯 (PE) 更多.
- 小尺寸的MP (∼250μm) 产生的MP-DOM度是大尺寸MP (∼5mm) 的2-6倍.
- 较低的光化学活性MPs (PE,大PP) 产生了持久的类似蛋白质的物质.
- 较高的光化学活性MPs (小PP) 将可生物利用的DOM转化为生物电分子.
- 累积的MPs-DOM分子在河流至海洋连续体中显示出日益增长的趋势.
结论:
- MP的固有属性 (类型,大小) 显著影响MP-DOM特征和转换途径.
- 议员-DOM组成各不相同,从不稳定的形式转变为反抗性的形式可能会影响海洋碳循环.
- 这项研究揭示了MP-DOM的关键结构-反应关系,强调了MP在海洋碳循环中的作用.
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