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 and Visser, Diederik and Martens, Wayde N. and Duong, Loc V. and 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.
Full text available as:
![[img]](/style/images/fileicons/application_pdf.png) | PDF 315Kb |
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.
| 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: | QUT Faculties and Divisions > Faculty of Science |
| 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: | 03 Dec 2008 12:14 |
Export: EndNote | Dublin Core
Repository Staff Only: item control page