A preliminary study of the reduction of Np(VI) by formohydroxamic acid using stopped-flow near-infrared spectrophotometry

Colston, Belinda and Choppin, Gregory R. and Taylor, Robin J. (2000) A preliminary study of the reduction of Np(VI) by formohydroxamic acid using stopped-flow near-infrared spectrophotometry. Radiochimica Acta, 88 (6). pp. 329-334. ISSN 0033-8230

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Official URL: http://dx.doi.org/10.1524/ract.2000.88.6.329

Abstract

The kinetics of the reduction of NpO2(2+) to NpO2(+) in nitric acid aquesous solution by formohydroxamic acid (FHA) were studied to allow more accurate flow sheet modelling of neptunium separation from uranium and plutonium in an Advanced PUREX process. The rate of the reaction was monitored using stopped-flow spectrophotometry with near-infrared detection. The conditional reduction rate in 2 M nitric acid at 22oC could be described by the following equation:

-d[NpO2(2+)]/dt = k [NpO2(2+)][FHA] (M/s)

with k = 1.17E+03 /M/s at [H+] = 2.0 M. Comparison with other data available in the literature, indicates that formohydroxamic acid is an unusually strong reducing agent for NpO2 (2+).

Item Type:Article
Additional Information:The kinetics of the reduction of NpO2(2+) to NpO2(+) in nitric acid aquesous solution by formohydroxamic acid (FHA) were studied to allow more accurate flow sheet modelling of neptunium separation from uranium and plutonium in an Advanced PUREX process. The rate of the reaction was monitored using stopped-flow spectrophotometry with near-infrared detection. The conditional reduction rate in 2 M nitric acid at 22oC could be described by the following equation: -d[NpO2(2+)]/dt = k [NpO2(2+)][FHA] (M/s) with k = 1.17E+03 /M/s at [H+] = 2.0 M. Comparison with other data available in the literature, indicates that formohydroxamic acid is an unusually strong reducing agent for NpO2 (2+).
Keywords:Neptunium reduction, Formohydroxamic acid, Stopped-flow, Advanced PUREX process
Subjects:F Physical Sciences > F170 Physical Chemistry
F Physical Sciences > F100 Chemistry
Divisions:College of Science > School of Life Sciences
ID Code:5122
Deposited By: Belinda Colston
Deposited On:29 Apr 2012 12:23
Last Modified:29 Apr 2012 12:23

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