This standard specifies the method for the determination of lead content in tungsten powder, tungsten bars, tungsten carbide, tungsten trioxide and other materials by flame atomic absorption spectroscopy (AAS). It is suitable for the determination range of lead content from 0.0003% to 0.0050%. The method involves the analysis of the sample by hydrogen peroxide and sodiumhydrate, the enrichment of lead using iron (III) as a co-precipitant, and finally the determination of lead content on AtomicAbsorption Spectroscopy. This standard ensures the accuracy and repeatability of lead detection in the chemical analysis of tungsten.