Kinetics of Nitrous Acid-Catalyzed Oxidation of Neptunium in Nitric Acid-TBP Extraction System
Kinetics of Nitrous Acid-Catalyzed Oxidation of Neptunium in Nitric Acid-TBP Extraction System
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DOI：
10.3327/jnst.32.118
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发表时间：
1995-02
影响因子：
1.2
通讯作者：
O. Tochiyama;Y. Nakamura;M. Hirota;Y. Inoue
中科院分区：
文献类型：
--
作者：
O. Tochiyama;Y. Nakamura;M. Hirota;Y. Inoue
在3~6M硝酸溶液中，~(239)Np与TBP或TOPO在正十二烷中萃取，研究了反应的氧化还原动力学。考虑到有关物种在硝酸溶液中活度系数的变化，方程中的速率常数-d[Np(V)]/dt=Kf[Np(V)]-Kt[Np(VI)]可表示为Kf=10−1.21[HNO3]t[HNO2]1/2(ysyu1/2/aw1/2)，式中y S为硝酸的化学计量活度系数。Y表示HNO2的活度系数，a表示水的合理活度。
The redox kinetics of the reaction was studied in 3 to 6M nitric acid solution by the extraction of tracer 239Np into TBP or TOPO in dodecane. Considering the changes in the activity coefficients of the relevant species in nitric acid solutions, the rate constant in the equation, -d[Np(V)]/dt=kf [Np(V)]-kT [Np(VI)], has been shown to be expressed by kf = 10−1.21[HNO3]t[HNO2]1/2(ysyu 1/2/aw 1/2 ), where y s is the stoichiometric activity coefficient of nitric acid. y u the activity coefficient of HNO2 and a w the rational activity of water.