FAAS测定汽车尾气催化剂中的铑

Determination of rhodium in automobile exhaust catalysts by FAAS method

采用火焰原子吸收（FAAS）法对汽车尾气净化催化剂中贵金属铑（Rh）的含量进行了分析．为避免共存元素Ni的谱线干扰，选择Rh的次灵敏线369．2nm作为分析线，采用标准加入法定量、有效地消除了基体元素对测试结果的影响．催化剂样品分析相对标准偏差（RSD）为1．8％～2．7％，加标回收率为102．9％～104．7％．

The content of rhodium in automobile exhaust catalyst was determined directly by flame atomic absorption spectrometry （FAAS） method. In this work, in order to avoid the interference of spectral line of the nickel, the second sensitive wavelength （369.2rim） of the rhodium was used as the detection wavelength. And the standard addition method was adopted to overcome the effects of the matrix elements. The assay results of the real sample showed that the relative standard deviation ranged from 1.8% to 2.7%, and the recovery from 102.9% to 104.7%, respectively.