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Removal of organic matter by disodium peroxodisulphate: effects on mineral structure, chemical composition and physicochemical properties of some clay minerals

Published online by Cambridge University Press:  09 July 2018

A. P. Menegatti ,
G. L. Früh-Green  and
P. Stille
A. P. Menegatti
Affiliation:
Laboratory for Clay Mineralogy, Geotechnical Engineering, ETH-Zurich
G. L. Früh-Green
Affiliation:
Institute for Mineralogy and Petrography, ETH-Zurich, Switzerland
P. Stille
Affiliation:
CNRS Centre de Géochimie de la Surface, Strasbourg, France
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Abstract

The use of disodium peroxodisulphate combined with a neutral buffer is a new method for the efficient removal of organic matter from clay-bearing sediments. The effects of this oxidation procedure on mineral structure were investigated by treatment of different standard clay minerals (kaolinite ‘china clay’, illite ‘Le Puy’, montmorillonite SWy-1). The materials were characterized by means of XRD, FTIR, SEM and TEM before and after leaching with disodium peroxodisulphate. Systematic experiments were conducted to determine the effects of leaching on the chemical and isotopic composition of oxygen, hydrogen and K-Ar in these samples. Effects on the physicochemical properties of the clays such as BET external surface area, cation exchange capacity (CEC) and expandability with ethylene glycol were also investigated. The results show that structure, chemical composition, oxygen and hydrogen isotope ratios, as well as the K-Ar system remain unaffected by leaching with disodium peroxodisulphate. The CEC and expandability remain unchanged, whereas changes in BET area can be attributed to mechanical dispersion by ultrasonic treatment.

Type
Research Article
Information
Clay Minerals , Volume 34 , Issue 2 , June 1999 , pp. 247 - 257
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1999

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