A preliminary study of the reduction of Np(VI) by formohydroxamic acid using stopped-flow near-infrared spectrophotometry
A preliminary study of the reduction of Np(VI) by formohydroxamic acid using stopped-flow near-infrared spectrophotometry
复制标题
停流近红外分光光度法初步研究甲异羟肟酸还原Np(VI)
DOI：
10.1524/ract.2000.88.6.329
复制
发表时间：
2000
影响因子：
1.8
通讯作者：
R. Taylor
中科院分区：
文献类型：
--
作者：
B. Colston;G. Choppin;R. Taylor
为了更准确地模拟先进Purex流程中NpO22+与铀、钚分离的流程图，研究了NpO22+在硝酸水溶液中被甲羟肟酸还原为NPO2+的动力学。采用近红外检测的停流分光光度法监测反应速度。在2M硝酸中，22℃条件还原速率可用下列方程描述：-d[NpO22+]/dt=k[NpO22+][FHA](M/S)，在[H+]=2.0M时，k=1.17×103M-1 S-1。
The kinetics of the reduction of NpO22+ to NpO2+ in nitric acid aqueous 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 22°C could be described by the following equation: -d [NpO22+]/dt = k [NpO22+][FHA](M/s) with k = 1.17×103 M-1 s-1 at [H+] = 2.0 M. Comparison with other data available in the literature, indicates that formohydroxamic acid is an unusually strong reducing agent for NpO22+.