In recent years, petroleum has grown rapidly, and the types of petroleum processed by refineries have become increasingly complex. The various salts contained in petroleum are not only prone to scaling in furnace tubes and heat exchangers during the processing, but also cause corrosion and catalyst poisoning in the processing equipment due to the hydrolysis of chlorides and sulfides, resulting in  HCI and  H2S. This can affect the long-term safe and stable operation of refining and  production equipment. Therefore, establishing a simple, fast, and accurate  method for detecting chlorine content is of great significance for refining production.