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Application of simplified desorption method to study on sorption of americium(III) on bentonite

Kozai, Naofumi; Yamasaki, Shinya; Onuki, Toshihiko

To elucidate the sorption behavior of americium(III) on bentonite 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 1M KCl aqueous solution, and the rest was the "unexchangeable" sorption. The exchangeable sorption was ion exchange of mostly Am$$^{3+}$$. 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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Category:Chemistry, Analytical

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