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Raman spectroscopy of natural oxalates

Frost, Ray L. (2004) Raman spectroscopy of natural oxalates. Analytica Chimica Acta, 517(1-2), pp. 207-214.

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Abstract

Oxalates are markers or indicators of environmental events. Oxalates are readily determined by Raman spectroscopy. Thus deterioration of works of art, biogeochemical cycles, plant metal complexation, the presence of pigments and minerals formed in caves can be analysed. A comparative study of a suite of natural oxalates including weddellite, whewellite, moolooite, humboldtine, glushinskite, natroxalate and oxammite has been undertaken using Raman spectroscopy. The minerals are characterised by the wavenumber of the CO stretching vibration which is cation sensitive. The band is observed at 1468 cm-1 for weddellite, 1489 cm-1 for moolooite, 1471 cm-1 for glushinskite and 1456 cm-1 for natroxalate. Except for oxammite, the infrared and Raman spectra are mutually exclusive indicating that the minerals are bidentate. Differences are also observed in the wavenumber of the water OH stretching bands of the minerals. The significance of this work rests with the ability of Raman spectroscopy to identify oxalates which often occur as films on a host rocks or works of art.

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ID Code: 812
Item Type: Journal Article
Keywords: oxalate, weddellite, moolooite, humboldtine, natroxalate, oxammite, glushinskite, Raman spectroscopy, infrared spectroscopy
DOI: 10.1016/j.aca.2004.04.036
ISSN: 0003-2670
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > INORGANIC CHEMISTRY (030200)
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2004 Elsevier
Copyright Statement: Reproduced in accordance with the copyright policy of the publisher: This journal is available online.
Deposited On: 10 Mar 2005
Last Modified: 29 Feb 2012 23:08

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