Reduction kinetics of Np(VI) by -butyraldehyde in tributyl phosphate diluted with -dodecane

Ban, Yasutoshi ; Asakura, Toshihide; Morita, Yasuji

The reduction kinetics of Np(VI) by -butyraldehyde in 30%TBP solution diluted with -dodecane were analyzed by spectrophotometry. Based on the results of both -butyraldehyde and nitric acid concentration dependencies on the Np(VI) reduction reaction, the rate equation was obtained as -d[Np(VI)]/d = [-C $_{3}$ H $_{7}$ CHO] $^{0.8}$ [HNO $_{3}$ ] $^{-2.0}$ [Np(VI)] $_{t}$ where = (1.00.2) 10 $^{-3}$ M $^{1.2}$ min $^{-1}$ at 294 1 K. The activation energy of the reaction was 76 5 kJ/mol. Redox equilibrium between Np(V) and N(VI), and reaction mechanism were discussed.

Language	:	English
Journal	:	Radiochimica Acta
Volume	:	92
Number	:	12
Pages	:	p.883 - 887
Publication Year/Month	:	2004/12
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Paper URL	:	https://doi.org/10.1524/ract.92.12.883.55113
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Keywords	:	Neptunium; n-butyraldehyde; Reduction; TBP
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Registration No. : A20030377
JAEA Abstracts No. :
Paper Submission No. : 14424

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