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2011•Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and AtomsRequires access

Kinetics of Reaction Between Pu(IV) and Hydroxysemicarbazide in Nitric Acid Solution

Songtao Xiao, Ye Guoan, Liu Xiechun, Luo Fangxiang, Lan Tian, Fengfeng Li

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Abstract

The kinetics of reaction between Pu(Ⅳ) and hydroxysemicarbazide(HSC) in nitric acid solution was studied.The rate equation is found to be:-dc(Pu(Ⅳ))/dt=kc(Pu(Ⅳ))c1.06(HSC)c-0.43(H+)c-0.58(NO-3),where k=(11.8±1.1)(mol/L)-0.046·s-1 at 22.1 ℃ and the activation energy Ea=(71.0±1.0) kJ/mol.Effects of c(HSC),c(H+),c(Fe3+),c(UO2+2),ionic strength and temperature on reduction rate of Pu(Ⅳ) were investigated.The results show that Pu(Ⅳ) can be rapidly reduced to Pu(Ⅲ) by HSC under normal conditions.The reaction rate can be accelerated by increasing concentration of hydroxysemicarbazide or temperature,and decreasing concentration of HNO3 or ionic strength.The influence of UO2+2 and Fe3+ on reaction rate is negligible.

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The kinetics of reaction between Pu(Ⅳ) and hydroxysemicarbazide(HSC) in nitric acid solution was studied.The rate equation is found to be:-dc(Pu(Ⅳ))/dt=kc(Pu(Ⅳ))c1.06(HSC)c-0.43(H+)c-0.58(NO-3),where k=(11.8±1.1)(mol/L)-0.046·s-1 at 22.1 ℃ and the activation energy Ea=(71.0±1.0) kJ/mol.Effects of c(HSC),c(H+),c(Fe3+),c(UO2+2),ionic strength and temperature on reduction rate of Pu(Ⅳ) were investigated.The results show that Pu(Ⅳ) can be rapidly reduced to Pu(Ⅲ) by HSC under normal conditions.The reaction rate can be accelerated by increasing concentration of hydroxysemicarbazide or temperature,and decreasing concentration of HNO3 or ionic strength.The influence of UO2+2 and Fe3+ on reaction rate is negligible.

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Available abstract

The kinetics of reaction between Pu(Ⅳ) and hydroxysemicarbazide(HSC) in nitric acid solution was studied.The rate equation is found to be:-dc(Pu(Ⅳ))/dt=kc(Pu(Ⅳ))c1.06(HSC)c-0.43(H+)c-0.58(NO-3),where k=(11.8±1.1)(mol/L)-0.046·s-1 at 22.1 ℃ and the activation energy Ea=(71.0±1.0) kJ/mol.Effects of c(HSC),c(H+),c(Fe3+),c(UO2+2),ionic strength and temperature on reduction rate of Pu(Ⅳ) were investigated.The results show that Pu(Ⅳ) can be rapidly reduced to Pu(Ⅲ) by HSC under normal conditions.The reaction rate can be accelerated by increasing concentration of hydroxysemicarbazide or temperature,and decreasing concentration of HNO3 or ionic strength.The influence of UO2+2 and Fe3+ on reaction rate is negligible.

Key concepts: Nitric acid, Ionic strength, Activation energy, Kinetics, Chemistry, Nuclear chemistry, Reaction rate, Chemical kinetics

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