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

Journal Article · · Physics and Chemistry of Minerals
 [1];  [2];  [3]
  1. University of Southern Denmark
  2. BATTELLE (PACIFIC NW LAB)
  3. EMSL FACILITY USERS
+ Show Author Affiliations

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 2007, 92, 587), 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 1H and 27Al MAS NMR 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.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1558368
Report Number(s):
PNNL-SA-136099
Journal Information:
Physics and Chemistry of Minerals, Journal Name: Physics and Chemistry of Minerals Journal Issue: 3 Vol. 46
Country of Publication:
United States
Language:
English

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Related Subjects

jarosite
alunite
gallium alunite
solid state NMR
paramagnetic NMR
hydronium ion
acid mine drainage