重铬酸钾氧化偶氮胂Ⅲ褪色光度法测定铂

Spectrophotometric Determination of Trace Platinum Based on Discoloring of ArsenazoⅢ Oxidized by Potassium Dichromate

在微酸性介质中痕量铂 (Ⅳ )对重铬酸钾氧化偶氮胂Ⅲ褪色反应有显著的催化作用 ,建立了测定痕量铂 (Ⅳ )的催化动力学光度法。方法的检出限为 0 31μg/L ,线性范围为 0 31～ 2 0 μg/L 。

A new kinetic spectrophotometric method for the determination of trace platinum(Ⅳ) was developed. The method is based on the catalytic effect of trace Pt(Ⅳ) on oxidation of ArsenazoⅢ with potassium dichromate in dilute sulphuric acid solution. The detection limit is 0 31 μg/L and the linear range of determination is 0 31～20 μg/L. The method was applied to the determination of platinum(Ⅳ) in some catalysts and ore samples.