火焰原子吸收光谱法测定汽车尾气催化剂中Pd的研究

Determination of Palladium in Automobile Exhaust Catalysts by FAAS Method

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H2O2+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0.1～15μg·mL-1,检测限为0.029μg·mL-1,相对标准偏差(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 analytical conditions and the coexisting elements interference were studied.The catalyst was dissolved by the mixture of H2O2 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 recovery rate range is from 99.6% to 101.2%.It is a simple and convenient method for accurate analysis of Pd in the exhaust catalysts.