HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Low, P. F. Search for Related Content PubMed Articles by Low, P. F. Agricola Articles by Low, P. F.

The Apparent Mobilities of Exchangeable Alkali Metal Cations in Bentonite-Water Systems¹

ABSTRACT

A direct current conductivity method was devised for determining the mobilities of exchangeable cations on close-packed clays in water. The method was applied to the determination, at several temperatures, of the apparent mobilities of K, Na, and Li ions on the respective, homoionic bentonites. The apparent mobilities were in the order Na > Li > K.

An Arrhenius type equation was used to calculate the activation energies for movement of the adsorbed ions. The observed activation energies were larger than those for the same ions in solution and were in the order Na > Li > K. The reasons for these observations were discussed and it was concluded that, in each case, the activation energy was due largely to the energy required to form a hole, into which the ion could move, in the adsorbed water.

¹ Journal Paper No. 1216, Purdue University Agr. Exp. Sta., Lafayette, Ind. Contribution from the Agronomy Department. Presented before Div. II, Soil Science Society of America, Nov. 18, 1957, at Atlanta, Ga.

² Professor of Soil Chemistry.

Received for publication December 23, 1957. Accepted for publication April 24, 1958.