GB/T 15454-2009 uses Ion chromatography to determine sodium, ammonium, potassium, mg and calcium ions in industrial chilled down water. The standard begins with a description of the determination principle, and then specifies the required equipment and reagents. Detailed description of water sample collection, pretreatment process, and specific operations of Ion Chromatography, such as parameter setting, calibrated Linear dispersion drawing, sample injection testing, etc. With this standard, the above ion content data can be accurately obtained, providing a key basis for the quality assessment of industrial chilled down water, helping to ensure the stable operation of the chill down system, and promoting the standardization process of industrial water testing.