Separation of Am (V,VI) from Cm(III) and Pr(III) in ammonia and ammonium carbonate media

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Abstract

New approaches to the selective isolation of Am from the actinide–lanthanide fraction of high-level wastes with preliminary oxidation of Am(III) to Am(V) and Am(VI) using ammonia and ammonia–carbonate media are proposed. It was found that, when ammonium hydroxide is added to a 0.1 M HNO3 solution containing Am(V), Cm(III) and Pr(III) (as a mimic of the behavior of lanthanides) to pH ~8, AmO2+ shows increased stability and is retained in solution up to 80%, and Cm(III) and Pr(III) in the form of poorly soluble compounds precipitate. It was also found that, in ammonia–carbonate solutions at pH ~10, up to 96% of the initial amount of Am(VI) is retained in the solution, and Cm(III) and Pr(III) precipitate to 85%.

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About the authors

P. A. Osin

Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences

Author for correspondence.
Email: Posingeohi@rambler.ru
Russian Federation, ul. Kosygina 19, Moscow, 119991

T. I. Trofimov

Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences

Email: Posingeohi@rambler.ru
Russian Federation, ul. Kosygina 19, Moscow, 119991

Yu. M. Kulyako

Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences

Email: Posingeohi@rambler.ru
Russian Federation, ul. Kosygina 19, Moscow, 119991

S. E. Vinokurov

Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences

Email: Posingeohi@rambler.ru
Russian Federation, ul. Kosygina 19, Moscow, 119991

B. F. Myasoedov

Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences

Email: Posingeohi@rambler.ru
Russian Federation, ul. Kosygina 19, Moscow, 119991

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3. Fig. 1. Spectra of the initial solution of Am(V) and Pr(III) in 0.1 mol/L HNO3 (solid line) and the solution after precipitation of Pr(III) (dashed line)

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4. Fig. 2. Spectrum of an aqueous solution after dissolution of americium precipitate in 0.1 mol/l HNO3.

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5. Fig. 3. Spectra of the initial solution of Am(III) and Pr(III) in 0.1 mol/L HNO3 (solid line) and the same solution after oxidation of Am(III) to Am(VI) (dashed line).

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6. Fig. 4. Spectra of the centrifugate after neutralization of the carbonate solution with HNO3 to pH 1 (dotted line) and the same solution after 1 day of storage (solid line)

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