Heavy Element Separation for Thorium-Uranium-Plutonium Fuels

Grant, G. R.; Morgan, W. W.; Mehta, K.; Sargent, F. P.

doi:10.1021/bk-1980-0117.ch025

Cited by 7 publications

(3 citation statements)

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“…Initially, the organic extract was placed in the UV/vis spectrophotometric cell (relative to a suitable blank) to confirm the existence of Np(VI). TBH was used as the reductant for Np(VI) present in the organic phase [20][21][22][23], and care was taken to maintain [Np]/[TBH] ∼ 2 in each experiment so as to avoid reduction of any Np(VI) produced during disproportionation by reaction 2. No further reduction of Np(V) has been reported from the use of TBH [21].…”

Section: Spectrophotometric Measurementsmentioning

confidence: 99%

“…No further reduction of Np(V) has been reported from the use of TBH [21]. [20,21]. The reductant was then added in suitable amounts to both sample and blank cells, and the cell contents were mixed thoroughly.…”

Section: Spectrophotometric Measurementsmentioning

confidence: 99%

“…The hydroquinone class of reductants is not strong enough to force the generation of Np(IV) directly from Np(V) at a significant rate [10]. Grant et al evaluated the use of this class of reagents for the reduction of plutonium in the organic phase during process development studies on U-Th-Pu spent fuels [21]. Rapid reoxidation of Pu(III) to Pu(IV) by the HNO 2 extracted by TBP into the organic phase was observed, resulting in a reduced separation factor (SF) of U with respect to Pu.…”

Section: Introductionmentioning

confidence: 99%

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Redox Behavior of Neptunium(V) in Tributyl Phosphate and N,N-Dihexyl Octanamide Extractants Dissolved in n-Dodecane

et al. 2012

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Spectrophotometric investigations have been carried out on the disproportionation of Np(V) to form Np(IV) and Np(VI) in 1.1 mol·L −1 solutions of tributyl phosphate (TBP) and in N,N-dihexyl octanamide (DHOA) in n-dodecane medium. The Np(V) was found to coordinate with Np(IV) in 1.1 mol·L −1 TBP solution in n-dodecane to form a mixed valence "cation-cation" complex by bonding through an axial oxo group on Np(V). By contrast, this interaction was less prominent in the case of 1.1 mol·L −1 DHOA solutions. The effect of 1-octanol, added as phase modifier, on the disproportionation behavior of Np(V) was also investigated. An attempt was made to calculate the disproportionation/reduction rate constants for Np(V) under the conditions of these studies. Absorbance measurements on the Np stripped from organic phases revealed the occurrence of Np(V) in the aqueous phase.

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