GB/T 6913-2023 is a standard for analytical methods for the content of phosphoric acid salts in boiler water and chilled down water. The standard describes in detail the steps and requirements for the determination of phosphoric acid salts using different chemical methods to ensure the accuracy and repeatability of the results. The concentration of phosphoric acid salts in boiler water and chilled down water is essential for the operation and corrosion control of the system, so this standard provides the necessary technical support for monitoring and managing water quality. By adopting this standard, users are able to effectively evaluate the content of phosphoric acid salts in water bodies, so that appropriate measures can be taken to maintain the operation of equipment and prolong the life of equipment.