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Identification by Raman microscopy of magnesian vivianite formed from Fe2+, Mg, Mn2+ and PO43- leached from metal and bone fragments in a Roman camp near Fort Vechten, Utrecht, The Netherlands

Kloprogge, J. Theo, Visser, Diederik, Martens, Wayde N., Duong, Loc V., & Frost, Ray L. (2003) Identification by Raman microscopy of magnesian vivianite formed from Fe2+, Mg, Mn2+ and PO43- leached from metal and bone fragments in a Roman camp near Fort Vechten, Utrecht, The Netherlands. Netherlands Journal of Geosciences/Geologie en Mijnbouw, 82(2), pp. 209-214.

Abstract

The presence of a magnesian vivianite (Fe2+)2.5(Mg,Mn,Ca)0.5(PO4)2.8H2O, has been identified in a soil sample from a Roman camp near Fort Vechten, The Netherlands, using a combination of Raman microscopy and scanning electron microscopy. An unsubstituted vivianite and bariĿite were characterised for comparative reasons. The split phosphate-stretching mode is recognised around 1115, 1062 and 1015 cm-1, while the corresponding bending modes are found around 591, 519, 471 and 422 cm-1. The substitution of Mg and Mn for Fe2+ in the crystal structure causes a shift towards higher wavenumbers compared to pure vivianite. As shown by the bariĿite sample substitution causes a broadening of the bands. The observed broadening however is larger than can be explained by substitution alone. The low intensity of the water bands, especially in the OH-stretching region between 2700 and 3700 cm-1 indicates that the magnesian vivianite is partially dehydrated, which explains the much larger broadening than the observed broadening caused by substitution of Mg and Mn in vivianite and bariĿite.

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ID Code: 897
Item Type: Journal Article
Additional URLs:
Keywords: bariĿite, iron phosphate, Raman microscopy, vivianite
ISSN: 0016-7746
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 2003 Netherlands Journal of Geosciences Foundation
Copyright Statement: The contents of this journal can be freely accessed online via the journal’s web page (see hypertext link).
Deposited On: 07 Apr 2005
Last Modified: 11 Aug 2011 04:06

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