在硫化-再氧化循环过程中,将溶解的有机物质分子分离与铁和硫的变化结合起来
Qian Sun1,2, Edward D Burton3, Dunfeng Si4
1College of Agricultural Sciences and Engineering, Hohai University, Nanjing 210098, China.
Environmental science & technology
|October 20, 2023
概括
硫化-再氧化循环改变了铁与有机物之间的联系,影响了溶解有机物 (DOM) 的命运. 重氧化捕获DOM,而基激素会降解它,影响碳和硫循环.
科学领域:
- 环境地质化学环境地质化学
- 生物地质化学循环过程
背景情况:
- 铁 (氧化) 氧化物和有机物 (OM) 在自然系统中密切相关.
- 硫循环,特别是硫化-再氧化,可以影响这些协会和OM的命运.
- 在氧化还原循环过程中,DOM分子分离和Fe/S转换之间的相互作用尚未得到充分理解.
研究的目的:
- 为了研究溶解有机物 (DOM) 分子分离与铁 (Fe) 和硫 (S) 变化的合.
- 阐明一个完整的硫化-再氧化循环对Fe-OM结合和DOM的影响.
- 了解Fe,C和S循环在氧化还原变量环境中的影响.
主要方法:
- 在无氧条件下与硫化物 (S(-II)) 发生反应的铁化物 (Fh) 和Fh-OM联结.
- 将产生的硫化系统暴露在空气中进行再氧化.
- 分析了Fe和S特化的变化,OM关联和DOM分子特征.
主要成果:
- 硫化物优先与Fh反应,形成无机S物种并改变Fe分化,间接影响OM命运.
- OM 抑制了 Fh 硫化,从而产生二次的 Fe 物种,如麦克纳和 Fe (II) -OM 化合物.
- 重氧化导致了Fh沉,重新捕获释放的OM,而基生成导致了DOM降解.
结论:
- 硫化改变了Fe的特异化,并释放了DOM,OM抑制了Fh的硫化.
- 重氧化导致OM的重新捕获和DOM通过基基的降解.
- 这些过程显著影响Fe,C和S循环在具有振荡的氧化还原条件的环境中.
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