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A series of single stage trials were conducted using six reducing reagents to investigate the rate determining step during Np(VI) reduction back-extraction from 30%TBP/Kerosene to HNO 3  solution under the same conditions. The six reducing reagents included: acetohydroxamic acid,  N,N -dimethylhydroxylamine,  N,N -diethylhydroxylamine, 2-hydroxyethylhydrazine, methylhydrazine and  N,N -dimethylhydrazine. Moreover, the back-extraction of Np(V) from 30%TBP/Kerosene to HNO 3  solution without reducing reagent was conducted with the same concentrations of Np and HNO 3 . The experimental results indicate the rate of Np(VI) reduction in the two-phase system is determined mainly by the rate of Np(V) mass transfer from 30%TBP/Kerosene to HNO 3  solution, whose mass transfer kinetics is far slower than previously estimated. The rate determining step is a slow chemical reaction as: NpO 2 NO 3 ·TBP = NpO 2  +  + NO 3  −  + TBP.

Rate determining step of reduction Np(VI) by organic reagents from 30%TBP/Kerosene to nitrate solution