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 Davis, L. E. Articles by Whittig, L. D. Search for Related Content PubMed Articles by Davis, L. E. Articles by Whittig, L. D. GeoRef GeoRef Citation Agricola Articles by Davis, L. E. Articles by Whittig, L. D.

Some Studies of the Autotransformation of H-Bentonite to Al-Bentonite¹

ABSTRACT

Duplicate samples of suspensions of H-bentonite prepared by the method of Aldrich and Buchanan (1) were heated at 35°, 50°, 65°, 80° and 95°C. At appropriate time intervals, samples were removed, cooled to 25°C., and titrated electrometrically with NaOH solution. The titration curves were markedly differentiated functions of time and temperature of heating.

Specimens heated for various periods at 95°C. were analyzed for the amount of replaceable Al and examined by X-ray diffraction analysis. Replaceable Al increased progressively with time of heating. X-ray diffraction analysis revealed that basal spacings and intensity of diffraction maxima increased with time of heating. The authors conclude that these changes are related to increase in the ratio of replaceable Al to H.

¹ Contribution from the University of California Agr. Exp. Sta., Davis. Presented before the Western Society of Soil Science, June 21, 1961, at Davis, Calif.

² Professor of Soils, Research Assistant, and Assistant Professor of Soils, respectively.

Received for publication October 30, 1961. Accepted for publication December 7, 1961.