GB/T 12737-2008 is suitable for the determination of trace sulfur compounds expressed as sulfate in industrial chemical products. The reduction and Titrimetric methods are used to reduce sulfur compounds to a titratable state first, and then determine with a suitable titrant. The standard specifies the required instruments, such as Burette, reduction device, etc., to clarify the preparation of reagents. Detailed description of Sample Handling steps, covering sample collection, pretreatment and reduction operation details. Standardized titration process, including titrant addition, end point judgment. According to this standard, trace sulfur compounds can be accurately determined, providing key data for mass control and production process optimization of industrial chemical products, and ensuring product mass and production safety.