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39K Solid-State NMR Studies of Potassium Tecto- and Phyllosilicates: The In Situ Detection of Hydratable K+ in Smectites

Published online by Cambridge University Press:  28 February 2024

J.-F. Lambert ,
R. Prost  and
M. E. Smith
J.-F. Lambert*
Affiliation:
I.N.R.A., Station de Science du Sol, Route de St-Cyr, 78026 Versailles Cedex, France
R. Prost*
Affiliation:
I.N.R.A., Station de Science du Sol, Route de St-Cyr, 78026 Versailles Cedex, France
M. E. Smith*
Affiliation:
Brüker Analytische Messetechnik, GMBH, Silberstreifen — D7512 Rheinstetten 4, FRG
*
1Current address: Laboratoire de Réactivité de Surface et Structure, Tour 54–55, 2ème étage, Université Pierre et Marie Curie, 4, Place Jussieu, 75252, Paris Cedex 05, France
2To whom correspondence should be addressed.
3Current address: CSIRO, Division of Material Science and Technology, Normanby Road, Locked bag 33, Clayton, Victoria 3168, Australia
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Abstract

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We report the first application of 39K solid-state NMR to the study of tecto- and phyllosilicates. Under high field (11.7 Tesla) and with the application of a spin-echo sequence, informative 39K spectra can be obtained for several compounds of interest to the geologist and the agronomist. Tectosilicates and phyllosilicates can be distinguished from the uncorrected frequency (δCG) of the observed NMR peak. A series of montmorillonites submitted to increasing numbers of wetting and drying cycles was studied in order to discriminate between mobile and “fixed” forms of K+: when the spectra are run on hydrated samples, two different signals are observed corresponding to K+ in different hydration states, and NMR data can be correlated with the amount of exchangeable K+ measured by ion exchange. Thus, it appears that NMR can provide useful information on K fixation complementary to classical chemical methods.

Keywords

PotassiumSolid-state NMRPhyllosilicatesVermiculiteMontmorillonite (potassium, wetting-drying of)
Type
Research Article
Information
Clays and Clay Minerals , Volume 40 , Issue 3 , June 1992 , pp. 253 - 261
Copyright
Copyright © 1992, The Clay Minerals Society

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