基于同位素的土壤元素排放从历史的采矿区的特性:驱动路径和相对贡献
Qingyi Cao1,2, Haiyan Hu1, Wei Yuan1
1State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China.
Environmental science & technology
|September 10, 2024
概括
微生物和光降解是采矿土壤元素 (Hg(0) 排放的主要驱动因素,微生物在循环和释放中发挥着关键作用.
科学领域:
- 环境化学环境化学
- 地质化学 地质化学
- 微生物学 微生物学
背景情况:
- 土壤中的 (Hg) 可以减少为元素 (Hg(0)),导致大气排放.
- 了解不同减少途径 (光化学,微生物,非生物) 的贡献对于命运和运输研究至关重要.
研究的目的:
- 量化光,微生物和非生物暗色减少途径对采矿土壤Hg{0}排放的相互作用和贡献.
- 在各种降解条件下,从土壤中发出的Hg(0) 的同位素特征的特征.
主要方法:
- 在受控的温度和光线条件下对采矿土壤进行实验室化.
- 分析 (Hg) 同位素特征 (δ202Hg和Δ199Hg) 在发射的Hg中.
- 应用同位素混合模型和Hg(0) 排放流量数据.
主要成果:
- 微生物和暗无生物还原产生了Hg(0) 与类似的,接近零的质量独立分数 (MIF).
- 光降解Hg(0) 呈现出显著的质量依赖分化 (MDF) 和MIF.
- 照相和微生物减少分别占总Hg(0) 排放量的79-88%和12-21% ,而非生物暗色减少是可以忽略的.
结论:
- 微生物是土壤Hg(0) 排放的关键驱动因素,促进了光和微生物减少途径.
- 这些发现有助于更好地了解从土壤中释放Hg{0}的生物地球化学过程.
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