本标准描述了在饮用水中使用的无水磷酸二钠。所述产品也称为磷酸氢钠，其盐为无水形式。无水磷酸二钠是一种正磷酸盐，用于配方和混合物中，以抑制饮用水输送系统的腐蚀。本标准所述的产品也称为无水磷酸二氢钠。本标准可在购买和接收无水磷酸二钠的文件中引用，并可作为测试无水磷酸二钠样品物理和化学性质的指南。本标准的规定适用于引用本文件时，且仅适用于饮用水、废水和再生水处理中使用的无水磷酸二钠。

This standard describes disodium phosphate, anhydrous, for use in the treatment of potable water, wastewater, and reclaimed water. The product described is also known as sodium hydrogen phosphate, with the salt in anhydrous form. Disodium phosphate, anhydrous, is an orthophosphate used, as formulated and in blends, to inhibit corrosion of potable water conveyance systems. The product described by this standard is also known as sodium phosphate, dibasic, anhydrous.This standard can be referenced in documents for purchasing and receiving disodium phosphate, anhydrous, and can be used as a guide for testing the physical and chemical properties of disodium phosphate, anhydrous, samples. The stipulations of this standard apply when this document has been referenced and then only to disodium phosphate, anhydrous, used in the treatment of potable water, wastewater, and reclaimed water.