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用分光光度法研究了ｃ（ＣＨ３Ｎ２Ｈ３）、ｃ（ＨＮＯ３）、ｃ（ＵＯ２＋２）、ｃ（ＨＮＯ２）、离子强度和温度等因素对Ｎｐ（Ⅵ）还原速率的影响。求出了Ｎｐ（Ⅵ）还原反应级数和不同反应条件下的表观反应速率常数，建立了反应速率方程式。温度为２４℃时，还原反应的表观反应速率常数ｋ２＝６１．３ｍｉｎ－１。反应的活化能为（５９．６２±１．１２）ｋＪ·ｍｏｌ－１。提高单甲基肼浓度，降低ＨＮＯ３浓度和升高温度有利于加快Ｎｐ（Ⅵ）的还原；离子强度和ＵＯ２＋２浓度对反应速率无明显影响；当反应体系中有ＨＮＯ２存在时，Ｎｐ（Ⅵ）还原速率明显提高。
The effect of c (CH3N2H3), c (HNO3), c (UO2 + 2), c (HNO2), ionic strength and temperature on the reduction rate of Np (Ⅵ) was studied by spectrophotometry. The order of Np (Ⅵ) reduction reaction and the apparent reaction rate constant under different reaction conditions were obtained. The reaction rate equation was established. The apparent reaction rate constant k2 = 61.3 min-1 for the reduction reaction at 24 ° C. The activation energy of the reaction was (59.62 ± 1.12) kJ · mol-1. Increasing the concentration of monomethyl hydrazine, decreasing the concentration of HNO3 and increasing the temperature could accelerate the reduction of Np (Ⅵ); the ionic strength and the concentration of UO2 + 2 had no significant effect on the reaction rate; while the presence of HNO2 in the reaction system reduced Np (Ⅵ) The rate is significantly higher.