在DOM光变中发现的时间动态和中间产品形成由液体染色学超高分辨率质谱学揭示
Peter Herzsprung1, Aleksandr Sobolev2, Wolf von Tümpling3
1UFZ - Helmholtz Centre for Environmental Research, Department Lake Research, Brückstraße 3a, Magdeburg D-39114, Germany.
Environmental science & technology
|June 28, 2025
概括
用高分辨率质谱测量研究了溶解有机物 (DOM) 的反应性. 揭示了对中间产品及其不同反应性的新见解,有助于水处理策略.
科学领域:
- 环境化学环境化学
- 分析化学 分析化学
- 生物地质化学生物地质化学
背景情况:
- 溶解有机物 (DOM) 复杂性已得到充分研究,但由于有限的高分辨率时间数据,其反应性仍然不清楚.
- 在 DOM 中的同位素重叠妨碍了基于极性等化学性质的组件转换的研究.
研究的目的:
- 在高时间分辨率的光照射下研究DOM转换的动态.
- 通过使用超高分辨率质谱仪 (UHPLC-UHRMS) 的在线超高性能液态染色学来解决极性范围内的异构DOM组成.
- 识别和描述中间产品 (IntP) 和它们的反应性.
主要方法:
- 使用TiO2辅助的废水处理厂废水的光照射.
- 采用高时间采样分辨率 (5小时内8个时间点).
- 在线应用UHPLC-UHRMS来分析DOM组成和转换.
主要成果:
- 在不同的极性分数中确定了新产品 (<10%),删除的组件 (25-60%),以及显著的中间产品 (20-60%).
- 发现IntP的H/C比率与达到峰值度的时间之间存在正相关性.
- 在不同的极性分数中观察到大约35%的DOM组件的差异反应性.
结论:
- 开发的方法为研究DOM反应性和转换提供了高时间分辨率.
- 提供了对DOM生物地化学解释的新视角.
- 通过识别潜在的有毒中间产品,提供了优化饮用水处理和废水处理的关键信息.
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