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Determination of the cation exchange capacity of clays with copper complexes revisited

Published online by Cambridge University Press:  09 July 2018

L. Ammann ,
F. Bergaya  and
G. Lagaly
L. Ammann
Affiliation:
Institute of Inorganic Chemistry, University of Kiel, D-24098 Kiel, Germany
F. Bergaya
Affiliation:
CRMD-CNRS-Université d'Orléans, 1b, rue de la Férollerie, F-45071 Orléans Cedex 02, France
G. Lagaly*
Affiliation:
Institute of Inorganic Chemistry, University of Kiel, D-24098 Kiel, Germany
*
E-mail: h.mittag@email.uni-kiel.de
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Abstract

The determination of the cation exchange capacity (CEC) of clays by exchange with the cationic copper complexes [Cu(en)2]2+ and [Cu(trien)]2+ is revisited. The procedures reported by Bergaya & Vayer (1997) and Meier & Kahr (1999) are modified slightly. The concentration of the copper complexes in the equilibrium solutions is measured by spectral photometry. Correct CEC values of the [Cu(en)2]2+ exchange are only obtained when a buffer (‘tris’, tris (hydroxymethyl) aminomethane, pH = 8) is added to the equilibrium solution after separation of the clay, because the molar extinction coefficient of this complex depends on the pH of the solution. A standard procedure is recommended as a reference method. In most cases, tris addition is not needed for the determination with [Cu(trien)]2+ cations. Nevertheless, tris addition is recommended in the standard procedure. Determination of CEC for 40 samples (kaolins, ‘common clays’, bentonites, montmorillonites and beidellite) shows a good agreement between measurements using [Cu(en)2]2+ and [Cu(trien)]2+ cations and with results by the ammonium acetate method.

Keywords

ammonium acetate methodbentonitesCECcompetitive adsorptioncopper complexes
Type
Research Article
Information
Clay Minerals , Volume 40 , Issue 4 , December 2005 , pp. 441 - 453
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2005

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