Chloride and sulfur may affect the chemical and physical properties of methanol, thereby affecting its quality and purity. It has a certain impact on industrial production processes and human health. In the production process, high levels of  sulfur and chloride may lead to equipment corrosion or catalyst deactivation. Meanwhile, these harmful substances  may also pose a potential threat to human health. The discharge of chloride and sulfur may lead to environmental  pollution and have adverse effects on the ecological environment. Online combustion ion chromatography can be used  for chloride and sulfur determination.