期刊论文

Analysis of Trace Oxalic Acid in Nitric Acid Solution Containing Constant Uranium and Plutonium

中文

核化学与放射化学

0253-9950

2021

43

02

153-157

10.7538/hhx.2020.yx.2020022

本校为其他机构

草酸对铬酸钾氧化甲基红的褪色反应有显著催化作用,基于单纯硝酸草酸体系中微量草酸的测定方法,进一步考察Mn2+、UO2+2和Pu4+对草酸测定的影响,并通过H柱消除体系中金属离子的干扰,考察了金属离子去除情况下分析方法的加标回收率和精密度。结果表明:草酸浓度在0～10.00μmol/L的范围内遵循比尔定律,线性回归方程为:1/ΔA=0.163 8c（H2C2O4）+0.837 2,相关系数r=0.999 9。方法应用于实际样品的测定,加标回收率在101%～102%之间,检出限为0.07μmol/L,相对标准偏差约0.76%～1.37%（n=5）,满足常量铀钚的硝酸溶液中微量草酸的分析需求。

Oxalic acid has a significant catalytic effect on the fading reaction of potassium chromate oxidizing of methyl red.According to the catalytic kinetic spectrophotometric method has been developed for determination of micro oxalate acid in pure nitric acid system,the influence of Mn~(2+),UO_2~(2+)and Pu~(4+)on determination of oxalic acid was further investigated.The H column can eliminate the interference of metal ions in the system,and the standard recovery and precision of the method were determinate.The results show that the concentration of...