催化褪色反应动力学法测定痕量铜

Spectrophotometric Determination of Trace Amounts of Copper (Ⅱ) by Catalytic Kinetics

作者发现铜(Ⅱ)对过氧化氢在硫酸介质中氧化甲基橙的褪色反应有催化作用,找到了影响催化褪色反应的最佳条件,建立了测定痕量铜(Ⅱ)的新方法。灵敏度为9.22×10^(-11)g/ml,测定范围0～2.0μgCu^(2+)/50ml。用于测定几种实物样品中的痕量铜,得到满意的结果。相对标准偏差0.2％～2.3％。

The catalytic effect of Cu(Ⅱ) on the decolorizing reaction resulted from the oxidation of methyl orange with hydrogen peroxide in an acid medium was found. The optimum conditions influencing the rate of the reaction were obtained. A new catalytic spectrophotometric method for the determination of trace copper was thus developed. The sensitivity of the method was 9.22×10^(-11)g/ml, the linear range of 0～2.0μg/50ml was obtained for Cu(Ⅱ). The method has been used to determine trace copper in samples with satisfactory results. The relative standard deviation was 0.19％～2.47％.