Application of simplified desorption method to study on sorption of americium(III) on bentonite |
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Authors: | Naofumi Kozai Shinya Yamasaki Toshihiko Ohnuki |
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Affiliation: | 1. Advance Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki, 319-1195, Japan
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Abstract: | To elucidate the sorption behavior of americium(III) on bentonite, which is a mixture of montmorillonite clay, quartz and other minerals, simplified desorption experiments were applied to the solid phases collected after the sorption experiments. The sorption–desorption behavior was examined in the final pH range from 2 to 8. The desorption experiments revealed that most of the Am was sorbed on the montmorillonite moiety of the bentonite. The sorption of Am on montmorillonite was divided into two types: one was the “exchangeable” sorption, in which the sorbed Am was desorbed with a 1 M KCl aqueous solution, and the rest was the “unexchangeable” sorption. The exchangeable sorption was ion exchange of mostly Am3+. The unexchangeable sorption was the strong sorption of Am hydroxides. An accessory iron mineral, pyrite, might be involved in the Am sorption on bentonite at neutral pH. |
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