偏二甲基肼还原Np(Ⅵ)的动力学研究

偏二甲基肼还原Np(Ⅵ)的动力学研究

摘要

摘要: 报道了用分光光度法研究硝酸体系中偏二甲基肼还原Ｎｐ（Ⅵ）的动力学。研究了偏二甲基肼浓度、酸度、温度、离子强度、ＵＯ２２＋浓度等因素对反应速率的影响，求出了反应的动力学方程。实验结果表明：偏二甲基肼还原Ｎｐ（Ⅵ）—→Ｎｐ（Ⅴ）的速度较快，但不能进一步还原Ｎｐ（Ⅴ）—→Ｎｐ（Ⅳ），提高偏二甲基肼浓度、降低酸度、升高温度均有利于加快反应速率。离子强度和ＵＯ２２＋浓度对反应速率的影响很小

Abstract: KINETIC STUDY OF Np(Ⅵ) REDUCTION WITH 1,1DIMETHYLHYDRAZINEYin Dongguang Zhang Xianye Hu Jingxin(China Institute of Atomic Energy,P.O.Box 275(26),Beijing 102413)ABSTRACTThe kinetic study of neptunium reduction with 1,1dimethylhydrazine in nitric acid system with spectrophotometry has been performed.The effects,such as 1,1dimethylhydrazine concentration,acidity,temperature,ionic strength and UO22＋ are investigated.The results show that Np(Ⅵ) can be rapidly reduced to Np(Ⅴ) by 1,1dimethylhydrazine and no further reduction of Np(Ⅴ) to Np(Ⅳ) is observed under usual conditions.The reaction rate can be accelerated by increasing 1,1dimethylhydrazin concentration and temperature,and decreasing acidity.The apparent activation energy (Ea) of this reduction is 47.2 kJ/mol.The influences of UO22＋ and the ionic strength of solution on reaction rate are negligible.The reaction rate equation can be expressed as follows:-dcNp(Ⅵ)dt=kcNp(Ⅵ)c(CH3)2NNH2c09HNO3 Key words 1,1Dimethylhydrazine Neptunium Reduction Reaction rate

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