Sodium hexametaphosphate is the sodium salt of phosphoric acid. Minimum sodium and maximum fluorine must be specified. It must not contain more than one part fluorine to 100 parts phosphorus, 75 parts per million of arsenic and 30 parts per million of heavy metals reported as lead. (AAFCO, 2003) Sodium hexametaphosphate is used as a sequestrant (food stabilizer). Due to its unnecessary use, and potential allowable heavy metal/arsenic content, it should be avoided.