火焰原子吸收光谱法测定汽车尾气催化剂中Pd的研究

摘要

研究了火焰原子吸收光谱法测定汽车尾气净化催化剂中的贵金属Pd.对测试条件和共存元素的干扰进行了研究.采用H_2O_2+HCl溶解催化剂,在基体元素共存的条件下,直接测定催化剂中的Pd.方法线性范围为0.1～15 μg·mL~(-1),检测限为0.029 μg·mL~(-1),相埘标准偏差(RSD)在0.8%～2.5%之间,加标回收率为99.6%～101.2%.方法简便,快速,准确,满足催化剂测试要求.%Palladium in automotive exhaust catalyst was determined by flame atomic absorption spectrometry (FAAS). The ana-lytical conditions and the coexisting elements interference were studied. The catalyst was dissolved by the mixture of H_2O_2 and HCl. Pd in the solution was directly determined by FAAS method. The linearity of working curve ranges from 0. 1 to 15 μg·mL~(-1); the detection limit is 0. 029 μg·mL~(-1); the relative standard deviation (RSD) range is from 0. 8% to 2.5%; and the re-covery rate range is from 99. 6% to 101.2%. It is a simple and convenient method for accurate analysis of Pd in the exhaust cata-lysts.