GB/T 4698.13-1996 stipulates the use of EDTA complexation Titrimetric method for the determination of zirconium in sponge titanium, titanium and titanium alloys. This standard is applicable to related metal material samples, and the zirconium content is determined by the complexation reaction of EDTA and zirconium. Clarify the required instruments, such as Burette, etc., specify the types of reagents and preparation requirements. Detailed description of Sample Handling, including dissolve, eliminate interfering elements and other steps, and also describes the titration operation process, such as titrant addition, reaction pH control and endpoint judgment. According to this standard, the amount of zirconium can be accurately determined, providing key data support for controlling product mass and evaluating alloy performance.