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Published in Soil Sci Soc Am J 46:47-50 (1982)
© 1982 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Dispersion of Chloride, Sodium, and Calcium Ions in Soils as Affected by Exchangeable Sodium1

Joseph E. Dufey2, Tarek H. Sheta3, Georges R. Gobran3 and Henri Laudelout2

ABSTRACT

A sand-clay soil mixture was equilibrated in a column with various NaCl-CaCl2 solutions at constant normality (0.03N). After each equilibration, the percolating solution was labeled successively with 36Cl, 22Na, and 45Ca. The breakthrough curves of the radioactive species made it possible to calculate both effective pore volume and, at a given Darcy velocity, the Peclet number (P) for each ion. PCl was found to decrease markedly when the exchangeable sodium percentage (ESP) increased from 0 to about 20%. PNa and PCa were almost not affected by changing ESP. The following sequence was observed: PCa < PNa < PCl.

The discriminatory mixing power of soil towards the three ions likely results from changing size of montmorillonite tactoids and from demixing of adsorbed Na and Ca cations.

Key Words: tactoid • diffusion • cation demixing • pore volume • Peclet number

NOTES

1 Contribution from the Soil Science Dep., Catholic Univ. of Louvain, Place Croix du Sud, 2, B-1348, Louvain-la-Neuve, Belgium.

2 Soil Scientist ("Chercheur Qualifié" of the "Fonds National de la Recherche Scientifique") and Professor of Soil Science, respectively, Univ. of Louvain-la-Neuve (see address above).

3 Soil Scientists, Soil Salinity and Alkalinity Lab., Bacous, Alexandria, Egypt.

Received for publication August 26, 1981. Accepted for publication August 26, 1981.






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Copyright © 1982 by the Soil Science Society of America.