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Ion Exchange Equilibria Involving Aluminum in a Kaolinitic Ultisol¹

ABSTRACT

Cation exchange equilibria in an acid Ultisol profile involving K-Al, Ca-Al, K-Ca, Na-K, and Na-Ca exchanges were studied. Selectivity coefficients, surface activity coefficients and free energy changes were computed using the thermodynamic formulations.

In exchange equilibria involving Al, the magnitude of selectivity coefficients K_c, was affected by pH, surface composition, and hydrolysis of Al. In equilibria not involving Al, good reversibility for K-Ca, Na-K and Na-Ca exchanges was obtained. Potassium was selectively adsorbed in all horizons of the profile. The over-all selectively sequence follows the order of K>Al>CaNa.

¹ Contribution of the International Institute of Tropical Agriculture (IITA), PMB 5320, Ibadan, Nigeria. Journal Paper no. 121.

² Soil Chemist, Soil Scientist, and Visiting Soil Scientist, respectively. Dr. Herbillon's present address: Faculty of Agronomic Sciences, Catholic Univ. of Louvain, Louvain-La-Neuve, Belgium.

Received for publication May 7, 1979. Accepted for publication November 29, 1978.