Kinetic study of the Np(VI) reduction by tert-butyl hydrazine

Kinetic study of Np(VI) reduction by tert-butyl hydrazine in nitric acid media is performed by spectrophotometry. The effects such as concentration of TBH, H+, NO3-, UO22+, Fe3+ and temperature are investigated. The results show that the reaction rate equation may be expressed as follows: -dc(Np(VI)/dt=kc(Np(VI)c0.9(TBH)/c0.75 (H+). The rate constant of the reaction at 25 degree C equals to 5.44 (mol/L)-015·min-1. The activation energy of the reaction equals to 61.2 kJ/mol. The influences of NO3-, UO22+, Fe3+ on the reaction rate are negligible in the concentration range studied. The reaction rate increases apparently with rising temperature