Solvent Extraction of Pentavalent Neptunium with n-Octyl(phenyl)-N,N-Diisobutylcarbamoylmethylphosphine Oxide.

1 January 1991

journal article
Published by Taylor & Francis in Journal of Nuclear Science and Technology

Vol. 28 (12) , 1100-1106
https://doi.org/10.3327/jnst.28.1100

Abstract

Solvent extraction of Np(V) from HNO₃ solution was experimentally studied with n-octyl(phenyl)-N, N-diisobutylcarbamoylmethylphosphine oxide (CMPO) as an extractant mixed with TBP and n-dodecane. In the low HNO₃ concentration, the Np(V) is weakly extractable, but effectively extracted in the high HNO₃ concentration (>4M) due to the disproportionation of Np(V) to Np(IV)and Np(VI). The distribution ratio of Np was increased by use of H₂O₂as a reductant of Np(V). More than 95% of Np was extracted with 0.8 M H₂O² in 2.2 M HNO₃ solution. It was shown that most of the Np extracted is in tetravalent state as expected from redox mechanism. The Np(IV) extracted in the organic phase was effectively stripped to the aqueous phase with H₂C₂O₄.

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