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Interaction of ammonia with vermiculite

Published online by Cambridge University Press:  09 July 2018

J. L. Ahlrichs ,
A. R. Fraser  and
J. D. Russell
J. L. Ahlrichs
Affiliation:
The Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen
A. R. Fraser
Affiliation:
The Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen
J. D. Russell
Affiliation:
The Macaulay Institute for Soil Research, Craigiebuckler, Aberdeen
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Abstract

The interaction of ammonia with Na—, NH4—, Ca—, Cu—, and Mg— forms of two vermiculites has been investigated by infrared spectroscopy and chemical analysis. Both NH4 ions and co-ordinated NH3 are produced in the interlayer space in amounts which depend on the exchangeable cation and the particle size of the vermiculite. With the exception of that in Cu-vermiculite, the co-ordinated NH3 is rapidly displaced by atmospheric water vapour. NH4 ions are slowly decomposed at normal humidity and more rapidly and completely at high humidity. The co-ordinated NH3 in Cu-vermiculite is converted to NH4. Relative amounts of NH4 and co-ordinated NH3 are influenced by particle size, smaller particles favouring NH4. The stabilities of both species to water vapour increase with particle size.

Type
Research Article
Information
Clay Minerals , Volume 9 , Issue 3 , July 1972 , pp. 263 - 273
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1972

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