钌催化溴酸钾氧化偶氮胂M反应的研究及其分析应用

Study on the catalytic effect of ruthenium on the oxidation reaction of arsenazo M by potassium bromate and its analytical application

在硫酸介质中,基于钌对溴酸钾氧化偶氮胂M(AM)褪色的催化作用,建立了测定钌的动力学光度分析法。非催化体系与催化体系在550nm波长处的吸光度差值,与钌的质量浓度在0～72μg/L范围内,有良好线性关系,检出限为3 78×10-6g/L。对40μg/LRu 测定11次的标准偏差为2 75%。考察了50多种共存离子的影响,贵金属和大多数常见离子不干扰测定。用于矿样中钌测定的相对标准偏差为0 99%～1 2%,加标回收率为96%～103%。

A kinetic spectrophotometric method has been developed for the determinations of ruthenium? based on its catalytic effects on the oxidation reaction of arsenazo M by KBrO_3 in the H_2SO_4 medium. A good linear relationship has been obtained between the difference in the absorbance of uncatalytic and catalytic system at 550 nm and the concentration of Ru? in the range of 0～72 μg/L,the detection limit is 3.78×10^(-6) g/L. The relative standard deviation for 11 replotting determination of 40 μg/L of Ru? is cal...