GB/T 6730.28-2006 for the determination of fluorine content in iron ore. It uses the Ion selective electrode method to clearly explain the determination principle and specify the required reagents and equipment. From the sample collection, preparation, to the specific determination process, including electrode calibrate, Measurement conditions, etc., there are detailed regulations, and the result calculation method is also given. This standard provides a unified specification for the accurate determination of fluorine content in iron ore, helping iron and steel enterprises to effectively control the mass of raw materials and standardize the testing of iron ore, which is of great significance to ensure the mass and safe production of steel products.