在煤炭中进行同位素分离和源分析
Qingyi Cao1, Guangyi Sun1, Liyuan Liu2
1State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China.
The Science of the total environment
|September 15, 2024
概括
中国的煤炭含有来自植物物质和热水活动的 (Hg). 同位素分析揭示了不同的签名,显示了天然循环如何影响煤矿储存.
科学领域:
- 地质化学 地质化学
- 环境科学 环境科学
- 同位素地球化学 同位素地球化学
背景情况:
- 煤炭是一个重要的自然储存 (Hg).
- 了解煤炭中的源是解读地球自然循环的关键.
- 同位素分离 (MDF和MIF) 提供了关于的起源和途径的见解.
研究的目的:
- 在中国煤炭样本中分析 (Hg) 同位素组成 (δ202Hg和 Δ199Hg).
- 研究Hg同位素特征与煤中的Hg (THg) 总含量之间的关系.
- 确定煤炭中Hg的主要来源和循环机制.
主要方法:
- 对Hg同位素的质量依赖分化 (MDF) 和质量独立分化 (MIF) 的分析.
- 在中国煤炭中对单个Hg物种和总Hg (THg) 的同位素分析.
- 汇编和审查现有关于煤中的同位素的研究.
主要成果:
- 煤炭中的不同Hg物种的Hg同位素组成在不同Hg物种之间有很大的差异.
- 热稳定的Hg物种显示较重的 δ202Hg值;HgS物种显示最负的 Δ199Hg值.
- 煤Hg来源于植物材料 (负 Δ199Hg) 和热水活动 (正 Δ199Hg).
- 煤炭THg含量增加与Δ199Hg上升趋势相关,在高Hg煤炭中接近零.
结论:
- 煤炭Hg储库是由陆地和海洋环境之间的自然Hg循环形成的.
- 板块构造学和热水活动在煤炭中的转移和缩中起着至关重要的作用.
- 煤中的同位素标志反映了积累和地质处理的复杂历史.
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