GB/T 6609.13-2004 provides a method for the determination of calcium oxidation content in aluminum oxide. Flame atomic absorption spectroscopy (AAS) is used to process aluminum oxide samples first to convert calcium oxidation into calcium ions in solution. Using a Flame atomization device to make calcium atomization, based on the absorption characteristics of calcium atoms to specific wavelengths of light, Absorbance is measured with the help of a light spectrum instrument to accurately calculate the calcium oxidation content in aluminum oxide. This standard provides key technology for aluminum oxide mass detection, which helps to control product quality and is widely used in aluminum oxide production, processing and other related industries.