GB/T 28727-2025 is a special project standard in the field of Gas Analysis, which specializes in the determination of trace sulfur compounds in gases, using flame photometry Gas chromatography, CG. The standard specifies the test principle, instrument requirements, operation steps and result calculation methods, and is suitable for the detection of trace sulfur compounds in various gases. The standard can unify the detection method and ensure the accuracy of the data, providing a reliable technical basis for gas purity control, process optimization and pollutant monitoring in the fields of chemical industry, environmental protection and energy.