SSSAJ Grow Your Career with SSSA
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

Published in Soil Sci Soc Am J 33:360-363 (1969)
© 1969 Soil Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Juo, A. S. R.
Right arrow Articles by Barber, S. A.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Juo, A. S. R.
Right arrow Articles by Barber, S. A.
Agricola
Right arrow Articles by Juo, A. S. R.
Right arrow Articles by Barber, S. A.

An Explanation for the Variability in Sr-Ca Exchange Selectivity of Soils, Clays and Humic Acid1

A. S. R. Juo and S. A. Barber2

ABSTRACT

The reason for the variability among soils in their effect on the Sr-Ca exchange selectivity was investigated in systems where Sr and Ca were the only competing ions and Sr was present in small amounts. The exchange selectivity theory of Eisenman was used to explain the results. The dominant factor governing the relative strengths of adsorption by the clay minerals studied was the relative energy of hydration of the two cations, so that Sr, the more weakly hydrated, was adsorbed more strongly than Ca. However on humic acid, where the carboxyl group was mainly responsible for the exchange adsorption, the field strength of the exchange site was important so that a reversed sequence occurred and Ca was adsorbed more strongly than Sr.

Investigations with soils confirmed the results using soil components. As the fraction of Sr on the exchanger phase was reduced, the relative Sr adsorption increased indicating that variable sites were present on all of the materials studied.

NOTES

1 Journal Paper no. 3443, Purdue University Agr. Exp. Sta., Lafayette, Ind. 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. Laboratory assistance of Mr. William Keltjens is gratefully acknowledged.

2 Research Associate and Professor of Agronomy, respectively.

Received for publication August 9, 1968. Accepted for publication January 13, 1969.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
The SCI Journals Agronomy Journal Crop Science
Vadose Zone Journal Journal of Plant Registrations
Journal of Natural Resources
and Life Sciences Education		 Journal of
Environmental Quality
Copyright © 1969 by the Soil Science Society of America.