GB/T 11841-1989 specifies a method for the determination of uranium content in uranium dioxide powder and pellets, using the ferrous sulfate reduction-potassium dichromate oxidation Titrimetric method. This standard applies to uranium dioxide powder and pellet samples. The principle is to reduce high-valent uranium by ferrous sulfate, and then use potassium dichromate oxidation titration. The standard specifies the required instruments, such as Burette, etc., and specifies the reagent requirements. Detailed description of Sample Handling steps, including dissolving, reduction, etc., as well as titration operation procedures, such as titration speed, end point judgment. According to this standard, uranium content can be accurately determined, providing key data for nuclear fuel production and quality control.