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Urea complexes with montmorillonite : an infrared absorption study*

Published online by Cambridge University Press:  09 July 2018

M.M. Mortland
M.M. Mortland*
Affiliation:
Department of Soil Science, Michigan State University, East Lansing, U.S.A.
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Abstract

Urea was observed to become protonated in H-, Fe-, and Al-montmorillonite films and to form hemisalts when urea was present in excess of the number of available protons. The fully protonated urea disappeared upon dehydration, then the original protonated condition was re-established by rehydration. This completely reversible reaction indicates the importance of water in the protonated form. Indications were that urea will coordinate through the carbonyl group to the metal ion in Cu (II), Mn (II), and Ni (II) montmorillonite. Urea may be bonded to the metal ion in Mg-, Ca-, Li-, Na-, and K-montmorillonite by coordination and possibly by ionization of the N-H bond. The importance of ion-dipole interaction in urea complexes with montmorillonite is suggested. Decomposition of urea to ammonium ions was observed mainly in the Cumontmorillonite system.

Type
Research Article
Information
Clay Minerals , Volume 6 , Issue 3 , July 1966 , pp. 143 - 156
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1966

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Footnotes

†

Professor of Soil Science. This work was supported by National Science Foundation Project GP 1978.

*

Authorized for publication by the Director as Journal Article No. 3695 of the Michigan Agricultural Experiment Station, East Lansing, Michigan.

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