Abstract: A novel method was developed to determine platinum and palladium content in industrial reforming oil decolefin catalyst under single acid closed digestion condition by ICP-OES. The effects of pretreatment and digestion conditions on the digestion of catalyst were investigated, and the digestion effects of the single acid digestion and conventional mixed acid digestion were compared. Additionally, this study systematically discussed the selection basis for spectral lines used in platinum and palladium analysis, as the influence of aluminum matrix on measured elements, impact of impurity elements, and interference between Pt and Pd elements results. The pre-treatment and digestion conditions for single acid were determined as follows: the catalyst samplewas burned at 550 ℃ for 4 h in air atmosphere and ground to a particle size of less than 120 μm; 0.2 g samples and 3 mL concentrated hydrochloric acid were added and digested in an airtight digestion tank at 180 ℃ for 6 h. Compared with the conventional mixed acid digestion method, the established method is simple, rapid and accurate, and has the advantages of less acid consumption,being friendly to laboratory personnel and environment. The method can be applied to the accurate determination of Pt and Pd in the range of 2.08-12 500 μg/g Pt and 2.67-12 500 μg/g Pd in the catalysts utilized in industrial reforming.

Key words: ICP-OES, deolefin, catalyst, simple acid, platinum, palladium