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Aluminium solubility characteristics of spodic B horizons containing imogolite-type materials

Published online by Cambridge University Press:  09 July 2018

J. P. Gustafsson ,
D. G. Lumsdon  and
M. Simonsson
J. P. Gustafsson
Affiliation:
Division of Land and Water Resources, Royal Institute of Technology, S-100 44 Stockholm, Sweden
D. G. Lumsdon
Affiliation:
Soil Science Group, Macaulay Land Use Research Institute, Craigiebuckler, Aberdeen AB15 8QH, UK
M. Simonsson
Affiliation:
Department of Soil Sciences, Swedish University of Agricultural Sciences, Box 7014, S-750 07 Uppsala, Sweden
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Abstract

Fifteen Swedish and Finnish soil samples from spodic B horizons containing imogolite-type materials were equilibrated with dilute NaCl and HC1 at 8°C. For the NaCl extracts, apparent equilibrium with respect to an AI(OH)3 phase was reached in one to two weeks. Equilibrium with respect to an imogolite-type phase was slower, especially at large soil:solution ratios. The results show that log *Ks (gibbsite), i.e. the logarithm of the solubility constant for reactive AI(OH)3 at 8°C was ~9.40 (8.29 at 25°C) while log *Ks (imogolite) was variable; for the soil studied in most detail it was 7.66 (6.64 at 25°C) As well-ordered gibbsite rarely forms in spodic B horizons, it is suggested that Al(OH)3 and poorly-ordered allophanic materials may be slowly converted to less soluble and less reactive imogolite-type materials.

Type
Research Article
Information
Clay Minerals , Volume 33 , Issue 1 , March 1998 , pp. 77 - 86
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1998

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