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2010•Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and AtomsRequires access

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

Liu Xiechun

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Abstract

The kinetics of reaction between Pu(Ⅳ) and formoxime (FO) in nitric acid solution was determined. The rate equation is found to be -dc(Pu(Ⅳ))/dt=kc(Pu(Ⅳ))c1.61(FO)c-0.88(H+) where k=(110.39±7.70) (mol/L)-0.73/s at 18.7 ℃. The activation energy is found to be Ea=(68.82±3.00) kJ/mol. Effects of c(FO), c(H+), c(Fe3+), c(UO2+2), c(NO-3) and temperature on reduction rate of Pu(Ⅳ) were investigated. Pu(Ⅳ) can be rapidly reduced to Pu(Ⅲ) by FO under normal conditions. The reaction rate can be accelerated by increasing concentration of formoxime, decreasing concentration of UO2+2 and H+, increasing concentration of Fe3+ and rising temperature. The influence of NO-3 on reaction rate is negligible.

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The kinetics of reaction between Pu(Ⅳ) and formoxime (FO) in nitric acid solution was determined. The rate equation is found to be -dc(Pu(Ⅳ))/dt=kc(Pu(Ⅳ))c1.61(FO)c-0.88(H+) where k=(110.39±7.70) (mol/L)-0.73/s at 18.7 ℃. The activation energy is found to be Ea=(68.82±3.00) kJ/mol. Effects of c(FO), c(H+), c(Fe3+), c(UO2+2), c(NO-3) and temperature on reduction rate of Pu(Ⅳ) were investigated. Pu(Ⅳ) can be rapidly reduced to Pu(Ⅲ) by FO under normal conditions. The reaction rate can be accelerated by increasing concentration of formoxime, decreasing concentration of UO2+2 and H+, increasing concentration of Fe3+ and rising temperature. The influence of NO-3 on reaction rate is negligible.

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Available abstract

The kinetics of reaction between Pu(Ⅳ) and formoxime (FO) in nitric acid solution was determined. The rate equation is found to be -dc(Pu(Ⅳ))/dt=kc(Pu(Ⅳ))c1.61(FO)c-0.88(H+) where k=(110.39±7.70) (mol/L)-0.73/s at 18.7 ℃. The activation energy is found to be Ea=(68.82±3.00) kJ/mol. Effects of c(FO), c(H+), c(Fe3+), c(UO2+2), c(NO-3) and temperature on reduction rate of Pu(Ⅳ) were investigated. Pu(Ⅳ) can be rapidly reduced to Pu(Ⅲ) by FO under normal conditions. The reaction rate can be accelerated by increasing concentration of formoxime, decreasing concentration of UO2+2 and H+, increasing concentration of Fe3+ and rising temperature. The influence of NO-3 on reaction rate is negligible.

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

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