The difference in the efficiency of dissolving different ceramic matrix materials for diesel particulate filter (DPF) will lead to great deviation in the determination of platinum and palladium content in the sample. Compared with the standard acid dissolution, the alkali melting method has better dissolution efficiency for different ceramic matrix materials, but the operation stability is poor. The effects of various acids on the dissolution of an aluminum titanate matrix were investigated by orthogonal test . The optimum acid solution to dissolve a 0.25 g sample was a .mixture of 8 mL hydrochloric acid and 4 mL nitric acid and 2 mL hydrofluoric acid The recovery of platinum and palladium was 97.1% and 98.7%, and the relative standard deviations were 2.86% and 1.50%, respectively. The results obtained by this method were equivalent to those by the standard acid solution method, for the analysis of cordierite base material and silicon carbide base material.%柴油颗粒过滤器(DPF)的不同陶瓷基材酸法溶解效果有差异,影响样品中铂钯含量测定.对比实验表明,与标准酸溶法相较,碱熔法对不同陶瓷基材均有较好的溶解效果,但操作稳定性较差.对钛酸铝基材样品,用正交试验法考察了多种酸溶试剂的影响,优恒出的酸溶试剂配比为采用8 mL盐酸,4 mL硝酸,2 mL氢氟酸溶解0.25 g样品,测定铂、钯的回收率为97.1%、98.7%,相对标准偏差分别为2.86%、1.50%,与标准酸溶法处理堇青石基材和碳化硅基材样品所得结果相当.
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