Recent advances in f-element separations based on a new method for the production of pentavalent americium in acidic solution

Mincher, Bruce J.; Schmitt, Nicholas C.; Schuetz, Brian K.; Shehee, Thomas C.; Hobbs, David T.

doi:10.1039/C5RA03196F

Title: Recent advances in f-element separations based on a new method for the production of pentavalent americium in acidic solution

Journal Article · Wed Mar 11 00:00:00 EDT 2015 · RSC Advances

DOI:https://doi.org/10.1039/C5RA03196F· OSTI ID:1252474

Mincher, Bruce J. ^[1]; Schmitt, Nicholas C. ^[1]; Schuetz, Brian K. ^[1]; Shehee, Thomas C. ^[2]; Hobbs, David T. ^[2]

Idaho National Lab. (INL), Idaho Falls, ID (United States)
Savannah River Site (SRS), Aiken, SC (United States). Savannah River National Lab. (SRNL)

The peroxydisulfate anion has long been used for the preparation of hexavalent americium (Am^VI) from the normally stable Am^III valence state in mildly acidic solutions. However, there has been no satisfactory means to directly prepare the pentavalent state (Am^V) in that medium. Some early literature reports indicated that the peroxydisulfate oxidation was incomplete, and silver ion catalysis in conjunction with peroxydisulfate became accepted as the means to ensure quantitative generation of Am^VI. Incomplete oxidation would be expected to leave residual Am^III, or to produce Am^V in treated solutions. However, until recently, the use of peroxydisulfate as an Am^V reagent has not been reported. Here, parameters influencing the oxidation were investigated, including peroxydisulfate and acid concentration, temperature, duration of oxidative treatment, and the presence of higher concentrations of other redox active metals such as plutonium. Using optimized conditions determined here, quantitative Am^V was prepared in an acidic solution and the UV/Vis extinction coefficients of the Am^V 513 nm peak were measured over a range of nitric acid concentrations. Furthermore, the utility of Am^V for separations from the lanthanides and curium by solvent extraction, organic column chromatography and inorganic ion exchangers was also investigated.

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Research Organization:: Savannah River Site (SRS), Aiken, SC (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC09-08SR22470

OSTI ID:: 1252474

Report Number(s):: SRNL-STI-2015-00142; RSCACL

Journal Information:: RSC Advances, Vol. 5, Issue 34; ISSN 2046-2069

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 24 works

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Effective separation of Am(III) and Cm(III) using a DGA resin via the selective oxidation of Am(III) to Am(V) Kazi, Zakir; Guérin, Nicolas; Christl, Marcus Journal of Radioanalytical and Nuclear Chemistry, Vol. 321, Issue 1 https://doi.org/10.1007/s10967-019-06571-0	journal	May 2019
Solvent Extraction and Fluorescence Spectroscopic Investigation of the Selective Am(III) Complexation with TS-BTPhen Kaufholz, Peter; Modolo, Giuseppe; Wilden, Andreas Solvent Extraction and Ion Exchange, Vol. 34, Issue 2 https://doi.org/10.1080/07366299.2016.1151308	journal	January 2016
Development of a Selective Americium Separation Process Using H ₄ TPAEN as Water-Soluble Stripping Agent Marie, Cécile; Kaufholz, Peter; Vanel, Vincent Solvent Extraction and Ion Exchange, Vol. 37, Issue 5 https://doi.org/10.1080/07366299.2019.1643569	journal	July 2019

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