The most important is the normal salt, Na 4 P 2 0 7, which is readily obtained by heating disodium orthophosphate, Na 2 HPO 4.
Other ingredients are disodium hydrogen phosphate; phosphoric acid and/or sodium hydroxide may have been added for pH adjustment.
Disodium phosphate is added to powdered milk to prevent gelation.
The three most common chelating agents are calcium disodium edetate, dimercaprol (BAL), and penicillamine.
Edetate calcium disodium (EDTA calcium) and dimercaprol (BAL) are given through an intravenous line or in shots, while succimer (Chemet) and penicillamine (Cuprimine, Depen) are taken by mouth.