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Influence of KBr conditioning on the infrared hydroxyl-stretching region of saponites

Published online by Cambridge University Press:  09 July 2018

M. Pelletier ,
L. J. Michot ,
O. Barrès ,
B. Humbert ,
S. Petit  and
J.-L. Robert
M. Pelletier
Affiliation:
Laboratoire "Environnement et Minéralurgie", INPL-ENSG-CNRS UMR 7569, 15 av. du Chamois, 54501 Vandoeuvre Cedex
L. J. Michot
Affiliation:
Laboratoire "Environnement et Minéralurgie", INPL-ENSG-CNRS UMR 7569, 15 av. du Chamois, 54501 Vandoeuvre Cedex
O. Barrès
Affiliation:
Laboratoire "Environnement et Minéralurgie", INPL-ENSG-CNRS UMR 7569, 15 av. du Chamois, 54501 Vandoeuvre Cedex
B. Humbert
Affiliation:
Laboratoire de Chimie Physique pour l'Environnement, UMR CNRS-UHP, Nancy I 7564
S. Petit
Affiliation:
"Hydr.A.S.A." CNRS-UMR6532, Université de Poitiers, 40 Av. du Recteur Pineau, 86022 Poitiers Cedex
J.-L. Robert
Affiliation:
Centre de Recherches sur la Synthèse et la Chimie des Minéraux, CNRS-UPR4201, 1A, Rue de la Férollerie, 45071 Orléans Cedex 2, France
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Abstract

In order to assess the influence of tetrahedral sheet charge on the hydroxyl-stretching vibration in clay minerals, a series of synthetic Na-saponites, with increasing layer charge, was studied by infrared (IR) spectroscopy. When recorded after KBr dilution either in transmission or diffuse reflectance, the IR spectra exhibit a component at ~3710 cm-1, the intensity of which increases linearly with increasing layer charge. When experiments are carried out without any dilution of the samples, this component is not observed, suggesting a Na+/K+ exchange upon mixing of the sample with KBr. The spectra obtained for K-saponite confirm this exchange. This shows that the dilution procedure can lead to serious misinterpretations of IR spectra in the OH-stretching region.

Type
Research Article
Information
Clay Minerals , Volume 34 , Issue 3 , September 1999 , pp. 439 - 445
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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