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Sodium-Calcium Exchange in Nile Delta Soils: Single Values for Vanselow and Gaines-Thomas Selectivity Coefficients¹

ABSTRACT

Na-Ca exchange measurements were carried out on 11 representative soils from the Nile Delta. Experiments were conducted over a wide range of exchanger compositions. Due to their common alluvial origin, all soils showed identical exchange properties.

The experimental data appeared to be well described either by a single Vanselow selectivity coefficient or by a single Gaines-Thomas coefficient. The Gapon coefficient, as originally defined, increased linearly with the exchangeable calcium fraction (or decreased with ESP). After examining the sensitivity of those coefficients to experimental errors, as a function of the exchanger composition, values of 5.97 and 2.30 mol/liter were calculated for the Gaines-Thomas and Vanselow coefficients, respectively. These correspond to a Gapon coefficient as redefined by Sposito equal to 48 (mol/m³).

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

² Research Soil Scientists, Soil Salinity and Alkalinity Lab., Bacous, Alexandria, Egypt.

³ Assistant and Professor in Soil Science, respectively.

Received for publication November 26, 1980. Accepted for publication April 5, 1981.

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