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Research Paper |
Laboratoire Environnement et Minéralurgie, UMR 7569 CNRS-INPL, Pôle de l’eau, 15, Avenue du Charmois, 54501 Vand
vre-lès-Nancy Cedex, France
* E-mail: delphine.vantelon{at}ensg.inpl-nancy.fr
(Received 6 July 2000; revised 9 November 2000)
Ten montmorillonites of different origins with variable Fe contents were analysed using transmission IR spectroscopy. Special attention was devoted to the OH-bending region to obtain information about the distribution of octahedral cations. For low to medium Fe contents (
0.56 per Si8 formula unit), a linear relationship between the position of the 
AlFeOH band and Fe content was observed. Such correlation might be explained by changes in the cistrans occupancy of Fe in the octahedral sheet. Deconvolution of the OH-bending domain allows us to discriminate three components (AlAlOH, AlMgOH and AlFeOH) which are correlated with cation abundances derived from chemical analysis. The relative area of each band can then be compared with theoretical areas calculated assuming a fully random distribution of cations in the octahedral sheet. Using such treatment, eight of the 10 montmorillonites studied presented a nearly randomized octahedral distribution. The two samples from Wyoming were clearly different as they exhibited a strong ordering tendency.
KEYWORDS: montmorillonite, smectite, bentonite, IR spectroscopy, OH-bending region, octahedral cations
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