NIR Spectroscopy of Selected Iron (II) and Iron (III) Sulphates
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Description
A problem exists when closely related minerals are found in paragenetic relationships. The identification of such minerals cannot be undertaken by normal techniques such as X-ray diffraction. Vibrational spectroscopic techniques may be applicable especially when microtechniques or fibre-optic techniques are used. NIR spectroscopy is one technique which can be used for the identification of these paragenetically related minerals and has been applied to the study of selected iron(II) and iron(III) sulphates. The Near–IR spectral regions may be conveniently divided into four regions (a) the high wavenumber region > 7500 cm-1 (b) the high wavenumber region between 6400 and 7400 cm-1 attributed to the first overtone of the fundamental hydroxyl stretching mode (c) the 5500-6300 cm-1 region attributed to water combination modes of the hydroxyl fundamentals of water, and (d) the 4000-5500 cm-1 region attributed to the combination of the stretching and deformation modes of the iron(II) and iron(III) sulphates. The minerals containing iron(II) show a strong, broad band with splitting, around 11000-8000 cm-1 attributed to 5T2g --> 5Eg transition. This shows the ferrous ion has distorted octahedral coordination in some of these sulphate minerals. For each of these regions, the minerals show distinctive spectra which enable their identification and characterisation. NIR spectroscopy is a less used technique which has great application for the study of minerals, particularly minerals which have hydrogen in the structure either as hydroxyl units or as water bonded to the cation as is the case for iron(II) and iron(III) sulphates. The study of minerals on planets is topical and NIR spectroscopy provides a rapid technique for the distinction and identification of iron(II) and iron(III) sulphates minerals.
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ID Code: | 2335 | ||
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Item Type: | Contribution to Journal (Journal Article) | ||
Refereed: | Yes | ||
ORCID iD: |
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Measurements or Duration: | 9 pages | ||
Keywords: | Coquimbite, Iron (III) Sulphates, Jarosite, Melanterite, Romerite | ||
DOI: | 10.1016/j.saa.2004.12.003 | ||
ISSN: | 1386-1425 | ||
Pure ID: | 34282600 | ||
Divisions: | Past > QUT Faculties & Divisions > Faculty of Science and Technology Past > QUT Faculties & Divisions > Science & Engineering Faculty Current > Research Centres > Australian Research Centre for Aerospace Automation |
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Copyright Owner: | Consult author(s) regarding copyright matters | ||
Copyright Statement: | This work is covered by copyright. Unless the document is being made available under a Creative Commons Licence, you must assume that re-use is limited to personal use and that permission from the copyright owner must be obtained for all other uses. If the document is available under a Creative Commons License (or other specified license) then refer to the Licence for details of permitted re-use. It is a condition of access that users recognise and abide by the legal requirements associated with these rights. If you believe that this work infringes copyright please provide details by email to qut.copyright@qut.edu.au | ||
Deposited On: | 28 Oct 2005 00:00 | ||
Last Modified: | 03 Mar 2024 06:32 |
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