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Clay mineralogy and surface charge characteristics of basaltic soils from Western Samoa

Published online by Cambridge University Press:  09 July 2018

R. Naidu ,
R. J. Morrison ,
L. Janik  and
M. Asghar
R. Naidu
Affiliation:
School of Pure and Applied Sciences, University of the South Pacific, Box 1168, Suva, Fiji Islands
R. J. Morrison
Affiliation:
Environment Research Institute, The University of Wollongong, Wollongong, NSW 2522, Australia
L. Janik
Affiliation:
CSIRO Division of Land and Water, Private bag no. 2, Glen Osmond, SA 5064, Australia
M. Asghar
Affiliation:
Queensland Department of Primary Industries, Towoomba, Q 4350, Australia
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Abstract

The clay mineralogy and surface charge characteristics of four basaltic soils from Western Samoa have been studied. The soils contained subordinate to dominant amounts of poorly ordered allophanic material in addition to varying amounts of crystalline free iron oxide minerals. Infrared studies revealed the presence of trace to subordinate amounts of kaolin minerals in all the soils. The surface charge-pH curves followed a constant potential model indicating the presence of substantial amounts of pH-dependent charge. Some negative charge was present, however, at pH values as low as 3.0 and small quantities of positive charge were detected at pH values as high as 9. Values for PZC ranged from 2.2 to 3.9 and these were generally higher than the pHo determined by the ΔpH method.

Type
Research Article
Information
Clay Minerals , Volume 32 , Issue 4 , December 1997 , pp. 545 - 556
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1997

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