This standard specifies three methods for the determination of sulfur content in limestone, dolomite and metallurgical lime: tube furnace combustion-potassium iodate Titrimetric method, high-frequency combustion infrared absorption method and barium sulfate weight method. The tube furnace combustion-potassium iodate Titrimetric method is suitable for samples with sulfur content of 0.01% to 0.5%. The scope of application of high-frequency combustion infrared absorption method is the same. The barium sulfate weight method is suitable for samples with sulfur content greater than or equal to 0.10%. The standard describes the principle and scope of application of each method in detail, providing standardized technical support for the accurate determination of sulfur content in limestone and dolomite.