GB/T 23837-2009 is an industrial cycle chill down water testing standard. It stipulates the use of atomic absorption spectroscopy (AAS) to determine the content of aluminum ions in water. Aluminum Ion concentration in industrial cycle chill down water affects the operation of equipment, and too high is easy to cause scaling, corrosion and other problems. This standard provides accurate measurement methods to help relevant enterprises monitor water quality, and ensures the stable operation of the chill down system by controlling the content of aluminum ions. It is of great significance in the management of industrial cycle chill down water quality and equipment maintenance.