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The apparent and partial molal volumes of K-montmorillonite

Published online by Cambridge University Press:  09 July 2018

E. A. Ferreiro  and
A. K. Helmy
E. A. Ferreiro
Affiliation:
Instituto de Edafologia e Hidrologia Universidad Nacional del Sur, Avenida Alem 925, Bahia Bianca, Argentina
A. K. Helmy
Affiliation:
Instituto de Edafologia e Hidrologia Universidad Nacional del Sur, Avenida Alem 925, Bahia Bianca, Argentina
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Abstract

The partial and apparent molal volumes of K-bentonite in pure water and in 0·5 M KCl were determined using pycnometer density data. The values obtained were found to increase with particle concentration. Theoretical values of the electrostatic contribution to the volume of particles calculated from an assumed model based on the electric double layer theory, gave values different from those found experimentally. This is explained as due largely to the uncertainties in the value of the clay specific surface area as well as to the assumed ideality of the model used.

Type
Research Article
Information
Clay Minerals , Volume 9 , Issue 4 , December 1972 , pp. 361 - 368
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1972

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References

Ferreiro, E.A. & Helmy, A.K. (1971) Clay Minerals, 9, ill.CrossRefGoogle Scholar
Harned, H. & Owen, B.B. (1958) The Physical Chemistry of Electrolyte Solutions. Reinhold Pubi., New York.Google Scholar
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Helmy, A.K., Assaad, F.F., Hassan, M.N. & Sadek, H. (1969) J. Soil Sci. 20, 274.CrossRefGoogle Scholar
Verwey, E.J.W. & Overbeek, J.Th.G. (1948) Theory of the Stability of Lyophobic Colloids, p. 70. Elsevier Pubi. Co., Amsterdam.Google Scholar