"GB/T 31311-2014 Metallurgical grade fluorite, determination of lead content solvent extraction atomic absorption spectroscopy (AAS) method" is the Chinese national standard, which stipulates the method of solvent extraction atomic absorption spectroscopy (AAS) for the determination of lead content in metallurgical grade fluorite. The standard applies to metallurgical grade fluorite. After separating impurities by solvent extraction, atomic absorption spectroscopy (AAS) is used to quantify lead. This method has high sensitivity and selectivity, and can accurately determine low levels of lead. The standard provides a scientific basis for the quality control and trade of metallurgical grade fluorite, helping to ensure the purity of fluorite in metallurgical and other industrial applications, ensuring product mass and environmental protection.