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用U(Ⅳ)-肼作为Pu的还原反萃剂,具有不含杂质、还原完全、反应速度较快等优点。在这种还原反萃工艺条件下,U(Ⅳ)和肼的走向、消耗量等是人们关注的重点。因此,U(Ⅳ)和肼的分析至关重要。重铬酸钾容量法是分析U(Ⅳ)浓度的常用方法,而溴代丁二酰亚胺滴定法和分光光度法也是肼分析的常用方法。在实际应用时,体系中一般是U、Pu、Np、Tc、肼等多种物质共存。本工作研究了这些共存物质的加入对分析U(Ⅳ)和肼的影响,并寻找适宜的分离分析方法。实验结果如下。1)在1BP复杂体系中,肼及微量的Np、Tc对容量法分析U(Ⅳ)的影响不大,但Pu(Ⅲ)的存在
With U (Ⅳ) - hydrazine as Pu reduction stripping agent, with no impurities, completely reduced, the reaction speed and so on. Under the conditions of this stripping and stripping process, U (Ⅳ) and hydrazine trends, consumption, etc. are the focus of attention. Therefore, the analysis of U (IV) and hydrazine is crucial. The potassium dichromate volume method is a common method for the analysis of U (IV) concentrations, and the bromosuccinimide titration and spectrophotometry are also common methods for hydrazine analysis. In practical applications, the system is generally U, Pu, Np, Tc, hydrazine and other substances coexist. This work studied the effect of these coexisting substances on the analysis of U (IV) and hydrazine, and found suitable separation and analysis methods. The experimental results are as follows. 1) In the 1BP complex system, hydrazine and trace Np and Tc have little effect on the volumetric analysis of U (Ⅳ), but the existence of Pu (Ⅲ)