催化动力学光度法测定痕量金

Catalytic Kinetec Spectrophotometry for the Determination of Trace Gold

研究了在硫酸介质中 ,痕量金 (Ⅲ )催化溴酸钾氧化铍试剂Ⅱ褪色的指示反应及其动力学条件 ,据此建立一种新方法 ,该方法的检测极限为 1.2 4× 10 -11g/mL ,线性范围为0～ 0 .4μg/ 2 5mL 。

A new Catalytic Spectrophotometic method has been developed for the determination of gold.The method is based on the fact that traces of Au(Ⅲ) exerts a Catalytic action on the oxidative decolorizing between BeryllonⅡ and potassium bromate in H 2SO 4 medium.The detection Unit is 1.24×10 -11g/mL for Au(Ⅲ),The range of the determination of Au(Ⅲ) is 0～0.4μg/25mL.The method has been applied to the determination of trace gold in simulated alloy with satisfactory results.