The GB/T 4324.7-2012 standard specifies the determination method of cobalt content in tungsten powder, tungsten bar, tungsten trioxide and other materials, and the applicable range is 0.0001% to 0.050%. The method uses hydrogen peroxide and ammonia water to analyze the sample. For purple tungsten and coarse tungsten carbide, tungsten trioxide needs to be burned first. After muriatic acid settling the main tungsten, the sample is excited by an argon plasma light source, and the light spectrum is measured by an Inductance coupled plasma emission light spectrum meter. The standard also specifies the purity of the reagent and the experimental conditions in detail to ensure the accuracy and Reliability of the determination.