分离富集动力学光度法测定痕量钯(Ⅱ)

Determination of Trace Palladium(Ⅱ) After Separation and Enrichment

研究了在稀硫酸介质中 ,痕量钯 (Ⅱ )催化溴酸钾氧化对溴偶氮氯膦腿色的指示反应及其动力学条件 ,据此建立测定痕量钯 (Ⅱ )的新方法 ,该方法的检出限为 1.33× 10 -10g/mL ,测定范围为 0～ 0 .4 μg/ 10mL。采用聚酰胺在盐酸或王水介质中分离富集样品中的钯 ,使方法的选择性大大提高。

A new catalytic spectrophotometric method has been developed for the determination of palladium(Ⅱ).The method is based on the fact that traces of palladium(Ⅱ) exert a catalytic action on the oxidative decolorizing between pB-chororphosphonazo and potassium bromate in H 2SO 4 medium. The detection limit is 1.33×10 -10 ?g/mL,for Pd(Ⅱ),the range of the determination of Pd(Ⅱ) is 0～0.4?μg/10?mL.Palladium samples were dissolved in aqua regia and the obtained trace palladium was separatied and enriched by polyamide.The method has been applied to the determination of trace palladium with satisfactory results