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Abstract. The kinetics of Pu(VI) and Np(VI) recovery by carbohydrazide in an aqueous nitric acid solution was researched spectrophotometrically. Regarding to Pu(VI) it was established that in the interval of [HNO3] = 0.75-3.0 M and [CO(N2H3)2] = 0.1-0.4 M, the reaction rate was proportional to the concentration of Pu(VI). The reaction order with respect to carbohydrazide was determined to be 2.3, and -3 to nitric acid. The found activation energy of the reaction was 111 kJ·mol −1 . Regarding Np(VI), it was found that in the interval of [HNO3] = 0.75-3.0 M and [CO(N2H3)2] = 0.03-0.12 M, the reaction rate was proportional to the Np(VI) concentration. Reaction order with respect to carbohydrazide was determined to be 1.15, and -1.35 with respect to nitric acid. The found activation energy of the reaction was 85 kJ·mol −1 . Based on this kinetic data, a possible fundamental reaction mechanism was theorized.