GB/T 14609-2008 is a standard in the field of grain and oil inspection. The content of copper, iron, manganese, zinc, calcium and mg in grains and their products is determined by flame atomic absorption spectroscopy (AAS). The content of these elements is related to the nutritional value and quality of grains and oils. The standard specifies the operation process in detail and provides a unified method for grain and oil inspectors, production enterprises, etc. Through accurate measurement, it can help enterprises control the mass of products, let consumers clearly understand the nutritional content of grains and oils, ensure the mass of products in the grain and oil market, and promote the scientific and standardized development of the grain and oil industry.