SSSAJ Journal of Natural Resources and Life Sciences Education
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Published in Soil Sci Soc Am J 35:566-571 (1971)
© 1971 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Differential Sr-Ca Bonding on Soil as Influenced by Bonding Site1

S. M. Elgawhary and S. A. Barber2

ABSTRACT

The Sr-Ca selectivity coefficient, kSr/Ca, was used to interpret the differential Sr-Ca bonding of cation exchange sites in two soils. A dominant complementary cation, K, was used to place the Sr and Ca on sites which favored Sr and Ca over K. As the equivalent fraction of Sr plus Ca in the equilibrium solution was reduced, kSr/Ca decreased, indicating that organic exchange sites were the first to be filled. When the complementary ion was Mg or Ba, kSr/Ca was much larger, indicating that these complementary ions competed more nearly equally with Sr and Ca for all exchange sites. There was a relationship between the log of the equivalent fraction of Sr plus Ca and kSr/Ca that was linear over segments of the range of equivalent fraction used.

Chromatographic separation of Sr and Ca on a Sidell soil reflected the kSr/Ca of this soil at low Sr plus Ca saturations. Little Sr and Ca separation occurred with the Edwards muck apparently because of the over-shadowing of the readily exchangeable cations by Sr and Ca adsorbed in very slowly exchangeable positions resulting in little movement of these ions.

NOTES

1 Journal Paper no. 4286 Purdue Univ. Agr. Exp. Sta., Lafayette, Ind., 47907. Contribution from the Department of Agronomy. This study was supported in part by the U.S. Atomic Energy Commission under contract AT(11-1)-1495. Received Jan. 4, 1971. Approved Apr. 13, 1971.

2 Research Associate and Professor of Agronomy, Purdue University, respectively.

Received for publication January 4, 1971. Accepted for publication April 13, 1971.






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Copyright © 1971 by the Soil Science Society of America.