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A new, efficient, one-step method for the removal of organic matter from clay-containing sediments

Published online by Cambridge University Press:  09 July 2018

L. P. Meier  and
A. P. Menegatti
L. P. Meier
Affiliation:
Laboratory for Clay Mineralogy, Geotechnical Engineering, Swiss Federal Institute of Technology, Zurich, Switzerland
A. P. Menegatti
Affiliation:
Laboratory for Clay Mineralogy, Geotechnical Engineering, Swiss Federal Institute of Technology, Zurich, Switzerland
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Abstract

For the purpose of clay examination, a new one-step method for the removal of organic matter was developed using sodium peroxodisulphate combined with different buffers such as sodium hydrogen carbonate, disodium hydrogen phosphate and disodium tetraborate. From an early Cretaceous black shale from the Apennines with a high organic carbon content, the <2 µm clay fraction was separated and contained 10.9 wt% organic carbon. To prevent decomposition of the clay layers, the period of oxidation was short (25-60 min) and the pH was kept between 5 and 9.5. Up to 98% of carbon was removed by this method.

Type
Research Article
Information
Clay Minerals , Volume 32 , Issue 4 , December 1997 , pp. 557 - 563
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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