比较酸溶法消解催化剂中Pt、Pd、Rh的研究

实验比较研究了盐酸、硝酸、氢氟酸、高氯酸、硫酸等几种酸以一定的配比混合消解催化剂试样，采用光度法测定试样中贵金属Pt、Pd、Rh的含量。结果表明：采用聚四氟乙烯消化罐，试剂用HCl-HF-H2O2溶解催化剂试样，更利于Pt、Pd、Rh的溶出，Pt、Pd、Rh的回收率分别为99.5%、99.8%、101.6%，相对标准偏差分别为3.04%、2.71%、1.80%。结果满意，方法简便，容易操作。

Comparison and Research of Acid Digestion Technique for Pt, Pd and Rh in Catalysts

Sample digestion methods of automobile catalysts were researched, based on a certain ratio of hydrochloric acid, nitric acid, hydrofluoric acid, perchloric acid and sulfuric acid. The content of Pt, Pd and Rh in samples was determined by UV spectrophotometry. The results show that the digestion method with hydrochloric acid, hydrofluoric acid and hydrogen peroxide and adopting a polytetrafluoroethylene (PTFE) digestion tank, is more beneficial to the digestion of Pt, Pd and Rh. The recovery rates of Pt, Pd and Rh are 99.5%, 99.8% and 101.6%, respectively. The relative standard deviation is 3.04% for Pt, 2.71% for Pd and 1.80% for Rh. The method is simple and the result is satisfactory.