Abstract:The analytical methods of rhodium, iridium and ruthenium in spent catalysts are studied. The nickelSsulphideSfire-assay is used for enrichment. The nickel button is melted together with aluminum, which is dissolved by (1+1) hydrochloric acid solution, and the precipitate is dissolved in a high-pressure digestion tank. Inductively coupled plasma atomic emission spectrometry is used to determine rhodium, iridium and ruthenium. The test results show that when 6g aluminum and nickel buttons are co-melting in a muffle furnace at 900 °C for 2 hours, the nickel buttons can be completely dissolved in (1+1) hydrochloric acid within 2 hours. The relative standard deviation RSD (n=7)of the method was between 1.17% and 7.67%. The recoveries of rhodium, iridium, and ruthenium were between 96.2% and 100.3% indicating that the method is accurate and reliable, and can meet the needs of trading and scientific research.