GB/T 24225-2009 Determination of total iron content in chromium ore by reducing Titrimetric method. Applicable to all kinds of chromium ore. Sample Handling of chromium ore is first used to convert the iron element into a reducible state, and then the high-priced iron is reduced to low-priced iron with a reducing agent, and then titrated with a suitable oxidation agent standard solution. The standard specifies the required instruments, such as Burette, etc., and specifies the preparation and calibration method of reagents. Detailed description of the Sample Handling process, including the operation points of the ore dissolving and reducing process. Standardized titration operation, according to this standard, the total iron content can be accurately determined, providing key data for the mass evaluation of chromium ore and the control of steel smelting raw materials.