GB/T 5686.7-2008 provides for the determination of sulfur content of ferromanganese and other materials by infrared absorption method and combustion neutralized Titrimetric method. The infrared absorption method uses the absorption characteristics of sulfur dioxide generated by sample combustion to detect infrared rays of specific wavelengths; the combustion neutralized Titrimetric method is quantified by the reaction of sulfur dioxide generated by combustion with a titrant. This standard applies to products such as ferromanganese and manganese silicon alloys. Clarify the required instruments, such as infrared sulfur detectors, titration devices, etc., and specify the preparation of reagents. Detail the Sample Handling and combustion operation steps. Standardize the two measurement processes. According to this standard, the sulfur content can be accurately determined, providing key data for product quality control and iron and steel smelting.