GB/T 1507-2006 stipulates the determination of available oxygen content in manganese ore by potassium dichromate Titrimetric method. It is suitable for all kinds of manganese ore. The method is based on the oxidation reduction reaction of available oxygen with specific reducing agent, and uses potassium dichromate as a titrant. The standard specifies the required instruments, such as Burette, etc., and specifies the preparation and use of reagents. Detailed description of the processing steps of manganese ore samples, including dissolving, separating interfering components, etc. Standardize the titration operation process, such as titration speed, end point judgment method. According to this standard, the effective oxygen content of manganese ore can be accurately determined, providing key data support for mass evaluation of manganese ore and industrial applications.