ICP-MS Determination of Platinum,Palladium and Rhodium in Vehicle-Use Catalyst with Microwave Assisted Sample Digestion

Sample of vehicle-use catalysts was digested with a mixture of 6 mL HCl,3 mL HNO3,1 mL HF and 4 mL H2O,and an aliquot of the sample solution was taken for ICP-MS determination of Pt,Pd and Rh.195Pt,105Pd and 103Rh were used as measuring elements.Values of detection limit(3σ) of Pt,Pd and Rh found were 0.003,0.5,0.002 μg·L-1 respectively.The proposed method was used in the analysis of 5 catalyst samples,the results obtained were in conformity with those obtained by 2 other labs.Values of recovery were found in the range of 85.5%-101%.