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 33:859-863 (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 Harter, R. D.
Right arrow Articles by Ahlrichs, J. L.
Right arrow Search for Related Content
PubMed
Right arrow Articles by Harter, R. D.
Right arrow Articles by Ahlrichs, J. L.
Agricola
Right arrow Articles by Harter, R. D.
Right arrow Articles by Ahlrichs, J. L.

Effect of Acidity on Reactions of Organic Acids and Amines with Montmorillonitic Clay Surfaces1

Robert D. Harter and James L. Ahlrichs2

ABSTRACT

The effect of pH on the nature of 2,4-D, Amiben, aniline, and urea adsorbed by montmorillonite has been characterized. In all cases the infrared spectra of air dry systems indicated a change of the compound to the acid or protonated form when the corresponding suspension pH was two to three pH units higher than the pKa of the molecule. This is consistent with previous studies which indicated that the clay surface in air dry systems is more acid than shown by electrometric pH readings of the suspension. At pH levels below the pKa the acids show evidence of adsorption by the clay. The amines acquire a positive charge and are capable of interacting with the clay exchange complex. Spectra of the aniline and urea adsorbed to acid clay were nearly identical to those of their hydrochlorides in the same environment, indicating reactions with the acid clay surfaces by protonated molecules.

NOTES

1 Journal Paper 3051, Purdue University Agr. Exp. Sta., Lafayette, Ind.; Contribution from the Department of Agronomy; Presented before Div. S-2 and S-3, Soil Science Society of America, Stillwater, Okla., August 1966. The paper is part of a Ph.D. thesis by the senior author.

2 Graduate Teaching Assistant and Professor. The senior author is now Assistant Professor. University of New Hampshire, Durham.

Received for publication July 22, 1968. Accepted for publication July 15, 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.