和铁在矿物中占用石-石固体溶液的结构影响
Andrew R C Grigg1, Luiza Notini1, Ralf Kaegi2
1Soil Chemistry Group, Institute of Biogeochemistry and Pollutant Dynamics, Department of Environmental Systems Science, ETH Zurich, Universitätstrasse 16, CHN, CH-8092 Zurich, Switzerland.
ACS earth & space chemistry
|February 21, 2024
概括
这项研究使用光谱学特征 (Al) 替代在jarosite矿物质. 像X射线衍射和拉曼光谱等技术有效量化来自酸硫酸盐土壤的天然样本中的Al含量.
科学领域:
- 矿物学和地质化学
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
背景情况:
- 阿卢尼特超级组包括jarosite和阿卢尼特,以Al或Fe含量区分.
- 中间石-阿鲁尼特固体溶液的理解很少,特别是在环境环境中.
- 酸性环境在这个超级组内承载着各种硫酸盐矿物相.
研究的目的:
- 为了将光谱和衍射数据与jarosite-alunite矿物中的Al替代相关联.
- 建立了在未溶解的天然石样本中表征Al-Fe替代的方法.
- 量化来自酸硫酸盐土壤环境的雅罗石中的Al替代.
主要方法:
- 对于单位细胞大小测量的X射线衍射 (XRD).
- 拉曼光谱用于峰值转移分析.
- 莫斯巴乌尔光谱仪用于磁性订制温度.
- 用于元素量化和映射的EDX光谱.
主要成果:
- 在Al替代和单元细胞大小,拉曼峰值位置和磁性订序温度之间发现了强烈的相关性.
- 元素映射有效地描述了jarosite中的Al含量.
- 合成jarosite系列显示高达9.5%的Al-for-Fe替代.
- 来自硫酸盐土壤的天然jarosite显示至少5%的Al-for-Fe替代.
结论:
- 光谱技术 (XRD,Raman,Mössbauer,EDX) 是有效的量化Al/Fe含量在jarosite-alunite矿物质没有样品溶解.
- 这些方法对于分析自然环境样本是有价值的,特别是当直接测量Al具有挑战性时.
- 这项研究表明,在天然石中存在显著的Al-Fe替代,影响其光谱特性.
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