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Ionic Exchange Behavior in a Loam Soil as Indicated by Movement of Radio-Calcium¹

ABSTRACT

Soil columns were used to study the movement of ⁴⁵Ca by leaching them with salt solutions of various concentrations and ionic combinations. The results showed that the distribution patterns of radio-calcium within the soil columns varied with the anionic species as well as with the type of cations of the salt solutions. Exchange and movement of radio-calcium was higher with sulfate than with chloride salt solutions. The difference is explained on the basis of the differential displacement of calcium from the exchange sites caused by the salts present in soil solution. The data obtained may have significance in understanding the development of solonetzic soils.

¹ Contribution No. 356, Research Council of Alberta, and Contribution no. 223, Soil Research Institute, Canada Dep. of Agr., Edmonton, Alberta. The authors wish to express their thanks to Dr. B. E. Reidel, Dep. of Pharmacy, Univ. of Alberta, for supplying the radio-calcium and for his continued interest in this study. Sincere appreciation is extended to the staff in Soils Dep., and to Dr. H. E. Harris of Chemistry Dep., Univ. of Alberta, for their valuable suggestions in reviewing this manuscript.

Received for publication May 16, 1966. Accepted for publication January 19, 1967.