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Effects of Ethylene Glycol Saturation Protocols on XRD Patterns: A Critical Review and Discussion

Published online by Cambridge University Press:  01 January 2024

Regine Mosser-Ruck ,
Karine Devineau ,
Delphine Charpentier  and
Michel Cathelineau
Regine Mosser-Ruck*
Affiliation:
UMR CNRS 7566 G2R, UHP, BP 239, 54506 Vandœuvre-lès-Nancy, France
Karine Devineau
Affiliation:
UMR CNRS 7569 LEM, INPL, BP 40, 54501 Vandœuvre-lès-Nancy, France
Delphine Charpentier
Affiliation:
UMR CNRS 7566 G2R, UHP, BP 239, 54506 Vandœuvre-lès-Nancy, France
Michel Cathelineau
Affiliation:
UMR CNRS 7566 G2R, UHP, BP 239, 54506 Vandœuvre-lès-Nancy, France
*
*E-mail address of corresponding author: [email protected]
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Abstract

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Study of the transformation of smectite to illite, chlorite or vermiculite via interstratified clay minerals needs precise qualitative and quantitative determinations of the different layers in the mixed-layer clays and is generally based on X-ray diffraction (XRD) patterns after specific treatments of the clay samples. Saturation with K or Mg followed by ethylene glycol (EG) solvation are classical methods used to identify high-charge smectite and vermiculite. These procedures have been applied to two experimental clays, one composed of smectite layers and the second, a mixture of vermiculite and smectite layers. Different methods of glycolation (EG vapor or liquid EG) produce significant differences in the XRD patterns. Comparison with literature data indicates that K-saturated, high-charge smectite (≈0.8 < total charge <1/unit-cell) and Mg-vermiculite (whatever its charge) do not expand in ethylene glycol vapor (d values ≈14–15 Å). Expansion to 17 Å in liquid ethylene glycol occurs for Mg-vermiculite with a total charge of <~1.2/unit-cell and for K-saturated, high-charge smectite, when the tetrahedral charge is <≈0.7/unit-cell. This study shows that: (1) glycolation procedures need to be standardized; (2) the use of saturation protocols using both liquid ethylene glycol and ethylene glycol vapor yields useful additional information about the distribution of charges in clay minerals.

Keywords

Ethylene Glycol SolvationHigh-charge SmectiteK SaturationMg SaturationVermiculite
Type
Research Article
Information
Clays and Clay Minerals , Volume 53 , Issue 6 , December 2005 , pp. 631 - 638
Copyright
Copyright © 2005, The Clay Minerals Society

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