过氧化封闭通过矿物保护稳定无氧沉积物中的有机碳
Duoying Zhang1, Yanjiao Chen2, Xunan Yang3
1School of Civil Engineering, Heilongjiang University, Harbin 150080, China.
Water research
|September 26, 2025
概括
过氧化 (CaO2) 的应用矛盾地稳定了沉积物有机碳 (OC). 而不是降解,地化学效应促进矿物沉,保护OC免受氧化和生物接触.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 微生物生态学 微生物生态学
背景情况:
- 沉积物修复通常涉及化学处理,如过氧化 (CaO2).
- CaO2具有双重效应:有机碳 (OC) 的直接氧化和间接的地球化学变化 (pH,Ca2+).
- 这些效应造成了一个悖论,氧化可能会降解OC,但矿物沉可以保护它.
研究的目的:
- 解决CaO2对沉积物影响的悖论OC.
- 要区分直接氧化和间接矿物保护机制.
- 评估CaO2对无氧沉积物中OC稳定性的净影响.
主要方法:
- 模拟沉积物封闭实验. 模拟沉积物封闭实验.
- 对OC可变性和化学物种的分析.
- 测量Ca2+透率和矿物沉.
- 评估微生物的化学异质营养活性.
主要成果:
- 矿物保护机制压倒性地占据了直接氧化的主导地位.
- CaO2处理导致沉积物OC池的显著稳定.
- 直接氧化仅限于表面层 (约1.5毫米).
- 二氧化深度透 (>20毫米),导致广泛的矿物沉和OC封装.
- 微生物的化学异质变性功能显著减少,这表明OC变得生物学上无法获得.
结论:
- 应用CaO2主要是稳定,而不是降解沉积物OC.
- 通过矿物沉的地球化学封存是主要的影响.
- 二氧化可以作为一种工具来提高OC在修复后的沉积物中的稳定性.
- 了解这些机制对于有效的沉积物管理和碳循环研究至关重要.
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