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 28:179-183 (1964)
© 1964 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 Schwertmann, U.
Right arrow Articles by Jackson, M. L.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Schwertmann, U.
Right arrow Articles by Jackson, M. L.
GeoRef
Right arrow GeoRef Citation
Agricola
Right arrow Articles by Schwertmann, U.
Right arrow Articles by Jackson, M. L.

Influence of Hydroxy Aluminum Ions on pH Titration Curves of Hydronium-Aluminum Clays1

U. Schwertmann and M. L. Jackson2

ABSTRACT

Vermiculite (particles 2 to 0.2 microns in diameter), after being treated with H-Amberlite IR-120, aged for 97 days, and suspended in 1N KNO3, showed a third buffer range between pH 5.5 and 7.6 on continuous titration with dilute NaOH. This third buffer range is attributed to neutralization of excess protons of Al-OH2 groups in positively charged hydroxy aluminum polymers formed on interlayer surfaces of vermiculite under the influence of their negative charge. This conclusion was reached on the basis of observance of the same additional buffer range in titration curves of partially neutralized and aged AlCl3-solutions (OH/Al ratios ranging from 1 to 2.25) and of vermiculite treated with the aged hydroxy aluminum solutions. The hydroxy aluminum polymers are only partly exchangeable by 1N KCl, and also are fairly resistant to treatment of the clay with H-resin. The X-ray diffractogram of the vermiculite shows an enhanced 7.2Å. (002) peak after H-resin treatment and aging, indicating more interlayer material. Hydroxy aluminum treated vermiculite and aged acid vermiculite showed reduced collapsibility on K saturation and heat treatment, pointing also to the occurrence of the hydroxy polymers in the interlayer position. Compared with similar reactions with montmorillonite from bentonite previously reported, these compounds form with greater avidity in vermiculite, have a greater stability to subsequent H-resin treatment, and have a higher resistance to exchange in KCl. These differences presumably arise because of the higher net negative charge of the vermiculite layers. Soil clays which give X-ray diffraction evidence of interlayer hydroxy aluminum show the third buffer range on treatment with H resin, without aging time or treatment with hydroxy aluminum solutions.

NOTES

1 Contribution from the Department of Soil Science, University of Wisconsin, Madison, supported in part by a travel grant to the first author from the Ministerium fur Ernährung, Landwirtschaft und Forsten der Bundesrepublik Deutschland, and in part by grants from the National Science Foundation and through the Research Committee of the University of Wisconsin Graduate School from the Wisconsin Alumni Research Foundation for equipment and laboratory facilities. Presented before Div. S-2, Soil Science Society of America, Nov. 19, 1963, at Denver, Colo.

2 Dozent, Institut für Bodenkunde, Technische Hochschule, Hannover, West Germany, and Professor of Soil Science, University of Wisconsin, respectively.

Received for publication June 3, 1963. Accepted for publication July 1, 1963.






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 © 1964 by the Soil Science Society of America.