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在现代Purex流程的发展中,随着核燃料燃耗的加深及对环境方面的要求,新型无盐还原剂的研究成为改善流程的一个重要方向。各国的后处理专家们已研究了多种无盐有机还原剂和络合剂,其中中国原子能科学研究院对二甲基羟胺无盐有机还原剂进行了较深入的研究。但是由于二甲基羟胺没有显色剂直接和羟胺基团形成特征显色体,基于羟胺、单甲基肼在弱酸性介质中使Fe(Ⅲ)还原为Fe(Ⅱ)后与邻菲啰林形成的配合物在510nm有吸收峰,据此提出了间接分光光度法测定微量羟胺、单甲基肼浓度的方法。此方法测量结果准确,操作简便,适合于通常情况下微量羟胺、单甲基肼的分析。
With the development of modern Purex process, with the deepening of nuclear fuel burnup and environmental requirements, the research of new salt-free reductant has become an important direction to improve the process. National post-treatment experts have studied a variety of salt-free organic reductants and complexing agents, of which China Institute of Atomic Energy on dimethylhydroxylamine salt-free organic reductant conducted a more in-depth study. However, due to the absence of chromogenic reagent of dimethylhydroxylamine to form the characteristic chromophore directly with hydroxyl amine groups, based on hydroxylamine, monomethylhydrazine reduced Fe (Ⅲ) to Fe (Ⅲ) in weakly acidic medium and then reacted with phenanthrene The resulting complex has an absorption peak at 510 nm, and a method of indirect spectrophotometric determination of trace hydroxylamine and monomethylhydrazine concentration is proposed. The method has the advantages of accurate measurement results and simple operation, and is suitable for the analysis of trace hydroxylamine and monomethylhydrazine under normal circumstances.