Different ways of chemical sample preparation of used automotive catalytic converters (ACCs) in analytical autoclaves with resistive heating are studied for subsequent determination of platinum, palladium, and rhodium by AES ICP. Conditions of autoclave decomposition of ACCs samples using binary mixtures of HCl-HNO 3 and HCl-H 2 O 2 that allow achieving quantitative extraction of platinum group metals into a solution without complete decomposition of the sample are determined. Universal methods of analysis of used ceramic based automotive catalytic converters are developed. The relative standard deviation of the analysis results according to the developed techniques is 11-5% rel. at contents of platinum, palladium, and rhodium from 0.03% to 0.3%.