GB/T 4698.10-1996 For sponge titanium, titanium and titanium alloys, the ferrous sulfate ammonium Titrimetric method is used to determine the amount of chromium in the case of vanadium. It is suitable for related metal samples, and the oxidation and reduction reaction between ferrous sulfate ammonium and chromium is achieved. The standard specifies the required instruments, such as Burette, etc., and specifies the selection and preparation of reagents. Detailed description of Sample Handling steps, including methods for dissolving and eliminating the influence of interfering elements such as vanadium. Explain the titration operation process, such as titrant addition speed, reaction condition control and endpoint judgment. According to this standard, the amount of chromium in vanadium-containing samples can be accurately determined, which helps to control product mass and evaluate alloy performance.