Petroleum coke with different sulfur contents has different application fields. For example, low sulfur coke can be used as a raw material for electrode production in smelters, medium sulfur coke is widely used in the aluminum refining industry, and high sulfur coke is used in chemical production, such as manufacturing calcium carbide, silicon carbide, etc. Therefore, measuring sulfur content helps determine the applicable fields and uses of petroleum coke. This article uses online combustion ion chromatography to detect the conversion of sulfur from petroleum coke combustion to sulfate ions