在长时间的光化学老化过程中从微塑料中出的溶解有机物质的分子指纹:对水生碳循环的影响
Zekun Zhang1, Zhao Liang Chen1, Yanjun Liu1
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, PR China.
Water research
|July 9, 2025
概括
微塑料将溶解的有机物 (DOM) 释放到水生系统中. 聚乙烯衍生的DOM可能会形成长期的碳池,影响气候,而其他微塑料会影响短期的碳循环.
科学领域:
- 环境化学环境化学
- 水上科学 水上科学
- 有机地化学 有机地化学
背景情况:
- 微塑料是新兴的水污染物,释放溶解有机物 (DOM).
- 老化微塑料衍生的DOM的分子构成和碳循环影响尚不清楚.
- 微塑料DOM对河流至海洋连续性的大规模贡献尚未得到充分证实.
研究的目的:
- 为了描述从老化微塑料 (聚烯,聚乙烯,聚烯) 中出的DOM分子.
- 评估这些微塑料衍生的DOM分子在自然水中的流行程度.
- 评估微塑料DOM对水生碳循环的潜在影响.
主要方法:
- 微塑料 (聚烯,聚乙烯,聚烯) 的光化学老化为180天.
- 超高分辨率的里埃变换离子循环子子共振质谱 (FT-ICR-MS) 用于DOM分子识别.
- 在947个自然水样中对DOM进行分析,以检测微塑料衍生分子.
主要成果:
- 在紫外线照射后确定了155 (聚烯),152 (聚乙烯) 和465 (聚烯) DOM分子.
- 在64.6%的自然水样中检测到微塑料衍生的DOM分子.
- 聚烯DOM类似于耐火天然DOM;聚烯和聚乙烯DOM更易变.
结论:
- 不同的微塑料类型产生不同的DOM,对碳循环产生不同的影响.
- 聚烯衍生的DOM可能会导致耐火碳池,这可能会对气候产生影响.
- 微塑料DOM是水生溶解有机物中重要的,但尚未研究的成分.
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