Identification of hydrogen species in alunite-type minerals by multi-nuclear solid-state NMR spectroscopy

被引：0
作者：
Elisabeth Grube
Andrew S. Lipton
Ulla Gro Nielsen
机构：
[1] University of Southern Denmark,Department of Physics, Chemistry and Pharmacy
[2] Environmental Molecular Science Laboratory,undefined
[3] Pacific Northwest National Laboratory,undefined
来源：
Physics and Chemistry of Minerals | 2019年 / 46卷
关键词：
Jarosite; Alunite; Gallium alunite; Solid state NMR; Paramagnetic NMR; Hydronium ion; Acid mine drainage;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
The various hydrogen species present in a series of synthetic hydroniumjarosite ((H3O)Fe3(SO4)2(OH)6), and ammonioalunite ((NH4)Al3(SO4)2(OH)6) as well synthetic potassium (Cr3+ and V3+) and hydronium (V3+, Cr3+, and Ga3+) analogues were identified and quantified by 1H and 2H MAS NMR spectroscopy. The results confirm the defect mechanism proposed for alunite Nielsen et al. (Am Miner 92: 587–597, 2007), and allow for identification and quantification of even a few percent structural defects. For the paramagnetic samples, the isotropic shift for G2-OH group (V3+, Cr3+, and Fe3+) span more than 1100 ppm, which is related to different d-electron configuration (d2, d3, and d5). Analysis of the 1H and 27Al MAS NMR spectra shows that the synthetic ammonioalunite contains small amounts (5–10%) of hydronium. Furthermore, the close structural relationship between of hydronium and gallium alunite is reflected by the 27Al and 71Ga quadrupole coupling parameters. Thus, the current work demonstrates the applicability of solid state NMR spectroscopy for identification and quantification of hydrogen species in both dia- and paramagnetic minerals.
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页码：299 / 309
页数：10
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