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Cation Exchange in Kaolinite-Iron Oxide Systems

Published online by Cambridge University Press:  01 January 2024

Grant W. Thomas  and
Allen R. Swoboda
Grant W. Thomas
Affiliation:
Virginia Polytechnic Institute, Blacksburg, Virginia, USA
Allen R. Swoboda
Affiliation:
Virginia Polytechnic Institute, Blacksburg, Virginia, USA
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Kaolinite, to which iron oxides had been added by heating with FeCl3 solution, was studied with regard to its cation exchange capacity. It was observed that net cations held (cations less anions) varied directly with pH. Cations and anions are removed in equivalent amounts when the clays are washed with water. Removal of exchangeable cations proceeds as the last anions are removed. As a consequence, the negative sites may become saturated with non-exchangeable hydroxy-aluminum ions. To obtain the true CEC of a kaolinite-iron oxide system, it is necessary to estimate the amount of nonexchangeable hydroxy-aluminum by conductometric titration.

Type
General Session
Information
Clays and Clay Minerals (National Conference on Clays and Clay Minerals) , Volume 11 , February 1962 , pp. 321 - 326
Copyright
Copyright © The Clay Minerals Society 1962

Footnotes

Supported in part by National Science Foundation.

References

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