铁的合:在吸附到氧化物时进行同位素分离
Xu Yvon Zhang1, David J Wilson2, Maartje F Hamers1
1Department of Earth Sciences, Utrecht University, 3584 CB Utrecht, The Netherlands.
ACS earth & space chemistry
|January 22, 2025
概括
(Li) 的同位素可以追踪气候变化. 富含氧化铁的不良晶状古希特,显著吸收Li,特别是在高pH下,影响全球气候模型.
科学领域:
- 地质化学 地质化学
- 环境科学 环境科学
- 矿物学是一门学科.
背景情况:
- 化学气候在地质时间尺度上调节全球气候.
- (Li) 同位素组成是气候变化和二次矿物形成的代理.
- 与铁 (Fe) 氧化物之间的相互作用被推断出来,但缺乏实验数据.
研究的目的:
- 在吸附到单个Fe-氧化物时调查Li的地化学行为.
- 确定goethite,hematite,wüstite和magnetite的Li吸收量. 这样我们就能得到一个比较好的结果.
- 在实验中限制Li-Fe-氧化物相互作用.
主要方法:
- 对铁氧化物的吸附实验 (哥,血,瓦斯,磁).
- 在pH范围 (4-12) 中对吸收的分析.
- 在氧化物和流体之间测量同位素分离率 (Δ7Li).
主要成果:
- 低晶度的戈伊纳米颗粒显示出显著的吸附 (20%在pH 4-10,90%在pH 12).
- 结晶良好的铁氧化物显示微不足道的吸附.
- 戈伊提特优先吸收轻的6Li同位素,其分离率为-16.7至-20.1‰的Δ7Li氧化液.
- 石的吸收与溶解-再沉反应有关.
结论:
- 吸附在不佳的晶体石上是富含氧化铁的关键过程,像石这样的高度受天气影响的环境.
- 矿物表面化学显著影响Li-矿物相互作用.
- 提供了关于循环和大规模提取潜力的见解.
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