This standard specifies a method for the determination of total carbon content in silica powders by infrared absorption method after combustion in an induction furnace. It is suitable for the determination of total carbon content in silica powders as raw materials for the production of polysilicon. The measurement range is 0.001% to 1.0% (mass fraction). Method summary involves the introduction of pure oxygen gas streams into the sample in a high-frequency induction furnace, the conversion of carbon to carbon dioxide and/or carbon monoxide at high temperatures in the presence of fluxes and Miscellaneous auxiliaries, and then the measurement of the infrared absorption Light spectrum of carbon dioxide and/or carbon monoxide in the gas stream, and the calculation of the carbon content in the sample. Reagents and materials include water, oxygen, pure iron, anhydrous sodium carbonate, sodium carbonate standard solution and tin flux.