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Abstract
The current investigating aims at spotlighting the
importance of cation exchange phenomenon as one of the most important processes affecting soil in many different ways among which sodicity, fertilization and contamination of soil with
hazardous heavy elements. Fulfilling such aims required
quantifying the ion exchange process through calculation of
selectivity coefficient of soils and their important components for cations of special concern. Thus, two surface soil samples were undertaken from Borg El-Arab (representing the calcareous soils) and Moshtohor (representing the Nile alluvial
noncalcareous soils). Both the selected soils besides their <separated clay fractions, the organic matter - free soils and two commercial clay minerals dominating in these soils were interduced in Na-Ca, K-Ca and Cd-Ca exchange equilibria. Equivalent fractions of the proper elements in equilibrium solution and on abovementioned exchange materials besides of the selectivity coefficient of these materials were computed.