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Selective Dissolution and Differential Infrared Spectroscopy for Characterization of 'Amorphous' Constituents in Soil Clays

Published online by Cambridge University Press:  09 July 2018

K. Wada  and
D. J. Greenland
K. Wada
Affiliation:
Faculty of Agriculture, Kyushu University, Fukuoka, Japan
D. J. Greenland
Affiliation:
Department of Agricultural Biochemistry and Soil Science, Waite Agricultural Research Institute, University of Adelaide, South Australia
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Abstract

Poorly crystalline inorganic materials were removed from soil clays of different origin and mineral composition by successive treatments with sodium dithionite, 2 % Na2CO3 and 0·5 N NaOH. Techniques are described whereby difference spectra representing the infrared absorption of the materials removed by the treatments can be obtained. These spectra indicate that the materials dissolved are related to the mineral composition of the soil clay. Dissolution of allophanes of different composition was only proved for two volcanic ash soil clays in which these dominated. Layer silicates, probably including kaolin, were dissolved from the clay fractions of the red-brown earth and krasnozem studied. In addition, alumina-rich gel-like material and gibbsite, but no allophanes, were dissolved from another volcanic ash soil clay in which gibbsite and layer silicates are present in considerable amounts.

Type
Research Article
Information
Clay Minerals , Volume 8 , Issue 3 , July 1970 , pp. 241 - 254
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1970

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