Fluorine, chlorine, bromine, and sulfides in diesel are produced after combustion, which can respond to inorganic salts and cause corrosion of internal combustion engines and related components. Sulfides, after combustion, produce SO2 and SO3, which are one of the main components of acid rain. Acid rain has serious adverse effects on the environment and ecosystem, such as damage to vegetation, acidification of water bodies, erosion of buildings and cultural heritage, etc. The total content of fluorine, chlorine, bromine, and sulfur in diesel can be determined by online combustion ion chromatography.