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对自然地陆地衍生的化有机化合物的分子洞察:化学多样性,物种化,与水生消毒副产品的比较
Xiangyu Zhu1,2, Enhui Wu1, Kun Wang1,3
1State Key Laboratory of Soil Pollution Control and Safety, Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang 310058, China.
天然化有机化合物 (HOC) 在土壤中丰富,在分子上与人造消毒副产品 (DBP) 不同. 这项研究描述了土壤的HOC物种和分子特征,为它们的环境命运提供了洞察力.
科学领域:
- 环境化学环境化学
- 有机地化学 有机地化学
- 质谱测量质量谱测量
背景情况:
- 化有机化合物 (HOC) 在土壤水系统中广泛存在,存在潜在的持久性和毒性风险.
- 虽然已认识到人为来源,但陆地生态系统中的自然HOC储越来越明显.
- 土壤HOC的分子性质仍然不太清楚,这阻碍了对它们的环境行为的评估.
研究的目的:
- 开发和优化一种方法来区分可从土壤中提取的高酸盐的物种化和分子特性.
- 为了研究森林土壤中自然HOC的分子多样性.
- 将陆地HOC的分子特性与人为消毒副产品 (DBP) 的分子特性进行比较.
主要方法:
- 使用 (超) 高分辨率质谱仪进行HOC分析.
- 优化样本提取溶剂和清理策略,以改善高化合物隔离.
- 分析了来自中国东部6个森林地区的土壤样本.
主要成果:
- 在所有地点的有机和水可提取的土壤分量中都检测到天然HOC (0.2-14.4%的信号丰度).
- 有机可提取的HOC富含脂质和蛋白质类化合物;水可提取的HOC主要由素和脂质类化合物占据主导地位.
- 与水生DBP相比,陆地HOC分量表现出明显的分子特征 (较高的氧化/芳香度,较低的和/生物可溶性).
结论:
- 建立了一种强大的方法来表征土壤HOC物种化和分子性质.
- 在森林土壤中展示了具有独特分子特征的显著自然HOC池.
- 提出了一个概念模型,将自然的陆地HOC与人为DBP区分开来,说明它们的不同起源和环境命运.
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