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2009•Nuclear Instruments and Methods in Physics Research Section B Beam Interactions with Materials and AtomsRequires access

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

Yang He

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Abstract

In order to understand the(hydroxyamino)acetic acid(HAAA) of reduction performance to Pu(Ⅳ),the kinetics of reaction between Pu(Ⅳ) and HAAA in nitrous acid solution was determined by spectrophotometrically method.The rate equation is-dc(Pu(Ⅳ))/dt=kc(Pu(Ⅳ))c1.50(HAAA)c-1.00(H+) c-0.63(NO-3),where reaction rate constant k=(42.1±4.2)(mol/L)-0.13·s-1 at 15.8 ℃.The activation energy Ea is(78.0±1.6) kJ/mol.Effects of c(HAAA),c(H+),c(Fe3+),c(UO2+2),ionic strength and temperature on reduction rate of Pu(Ⅳ) were investigated.Pu(Ⅳ) can be reduced to Pu(Ⅲ) rapidly by HAAA under usual conditions.The reaction rate can be accelerated by increasing concentration of HAAA,decreasing HNO3 concentration and ionic strength as well as rising temperature.The influence of UO2+2 on reaction rate is negligible.The application of HAAA in the separation between Pu and U is promising.

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In order to understand the(hydroxyamino)acetic acid(HAAA) of reduction performance to Pu(Ⅳ),the kinetics of reaction between Pu(Ⅳ) and HAAA in nitrous acid solution was determined by spectrophotometrically method.The rate equation is-dc(Pu(Ⅳ))/dt=kc(Pu(Ⅳ))c1.50(HAAA)c-1.00(H+) c-0.63(NO-3),where reaction rate constant k=(42.1±4.2)(mol/L)-0.13·s-1 at 15.8 ℃.The activation energy Ea is(78.0±1.6) kJ/mol.Effects of c(HAAA),c(H+),c(Fe3+),c(UO2+2),ionic strength and temperature on reduction rate of Pu(Ⅳ) were investigated.Pu(Ⅳ) can be reduced to Pu(Ⅲ) rapidly by HAAA under usual conditions.The reaction rate can be accelerated by increasing concentration of HAAA,decreasing HNO3 concentration and ionic strength as well as rising temperature.The influence of UO2+2 on reaction rate is negligible.The application of HAAA in the separation between Pu and U is promising.

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Available abstract

In order to understand the(hydroxyamino)acetic acid(HAAA) of reduction performance to Pu(Ⅳ),the kinetics of reaction between Pu(Ⅳ) and HAAA in nitrous acid solution was determined by spectrophotometrically method.The rate equation is-dc(Pu(Ⅳ))/dt=kc(Pu(Ⅳ))c1.50(HAAA)c-1.00(H+) c-0.63(NO-3),where reaction rate constant k=(42.1±4.2)(mol/L)-0.13·s-1 at 15.8 ℃.The activation energy Ea is(78.0±1.6) kJ/mol.Effects of c(HAAA),c(H+),c(Fe3+),c(UO2+2),ionic strength and temperature on reduction rate of Pu(Ⅳ) were investigated.Pu(Ⅳ) can be reduced to Pu(Ⅲ) rapidly by HAAA under usual conditions.The reaction rate can be accelerated by increasing concentration of HAAA,decreasing HNO3 concentration and ionic strength as well as rising temperature.The influence of UO2+2 on reaction rate is negligible.The application of HAAA in the separation between Pu and U is promising.

Key concepts: Ionic strength, Chemistry, Nitric acid, Acetic acid, Kinetics, Activation energy, Nitrous acid, Reaction rate constant

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