容量法测定硝酸肼和U(Ⅳ)

为了测定U(Ⅳ)和硝酸肼共存时U（Ⅳ）和硝酸肼的含量,用重铬酸钾和邻菲咯啉分别作U（Ⅳ）的氧化滴定剂和指示剂，溴代丁二酰亚胺（RNBr）和甲基红分别作硝酸肼的氧化滴定剂和指示剂。在硝酸介质中，对同一样品，通过调节硝酸浓度，先后测定了U（Ⅳ）和硝酸肼的含量。测定结果表明，U(Ⅳ)的质量浓度在5.5～205mg/mL范围内，精密度优于2.0%；硝酸肼浓度在0.05～1.0mol/L范围内，精密度优于2.0%。

Determination of U(Ⅳ) and Hydrazine Nitrate by Volumetry

To be determined U(Ⅳ) and hydrazine nitrate in exist together, chromium(Ⅵ)and 1,10 phenanthroline is used individually as oxidation titrator and indicator for U(Ⅳ),and N-bromineimino and methyl red is used individually as oxidation titrator and indicator for hydrazine nitrate，U(Ⅳ) and hydrazine nitrate in the same sample is determined sequentially in the nitric acid by adjusting concentration of nitric acid. Results show that the precision is better than 2.0% when the mass concentration of U(Ⅳ) is ranged over 5.5～205mg/mL;and the precision is better than 2.0% when the concentration of hydrazine nitrate is ranged over 0.05～1.0mol/L.