KINETICS OF U, NP, AND PU REDOX REACTIONS IN TBP SOLUTIONS .4. NP(VI) REDUCTION BY HNO2

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作者：
KOLTUNOV, VS
FROLOV, KM
SINEV, MY
ISAEV, YV
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来源：
SOVIET RADIOCHEMISTRY | 1992年 / 34卷 / 04期
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中图分类号：
O65 [分析化学];
学科分类号：
070302 ; 081704 ;
摘要：
The reaction of Np(VI) and HNO2 in TBP solution is reversible. The equilibrium shifts towards Np(V) as [HClO4] decreases. The rate of Np(VI) reduction obeys the equation -d[Np(VI)]/dt = k[Np(VI)][HNO2]/[HClO4]. The rate constant k = (9.12 +/- 0.90).10 min-1 at 20-degrees-C The activation energy E = 34.2 +/- 1.0 kJ/mole. The rate is independent of [H2O] and [TBP] in a benzene mixture. The reaction mechanism includes a slow electron-transfer step between solvated Np(VI) perchlorate and NO2-.
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页码：450 / 453
页数：4
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