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Clay Minerals GSW 2008 Users' Group Meeting
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Clay Minerals; April 1984; v. 19; no. 2; p. 137-149
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The adsorption of quadrivalent cerium by kaolinite

F. Laufer, S. Yariv, and M. Steinberg

Heb. Univ., Dep. Inorg. and Anal. Chem., Jerusalem, Israel

Cerium may be adsorbed either as a monomeric species or as a polymeric hydroxy cation. The species adsorbed depends on the concentration of cerium in the stock solution, the age of this solution prior to the preparation of the equilibrium system and on the equilibration period. Adsorbed cations undergo polymerization on the surface of the kaolinite; the resulting polymeric species forms strong bonds with the clay surface--it is not desorbed by sulfuric acid--and may be considered fixed. Adsorption of cerium reaches a maximum in solutions containing 0.15 M sulfuric acid.

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