21. Antacids and chelating agents combine chemically in the body. 22. This mixture contains ammonium thiosulphate and ferrous EDTA, a powerful chelating agent. 23. Other bismuth carboxylates have typically been trapped using chelating amines such as bipyridine. 24. Siderophores are usually classified by the ligands used to chelate the ferric iron. 25. Other approaches include precipitation methods and sequestration by the addition of chelating agents. 26. There are two categories of decalcifying agents namely, chelating agents and acids. 27. It has the ability to chelate small cations, leaving anions more active. 28. It is a bidentate chelating ligand, forming complexes with many transition metals. 29. Many compounds containing metals in rings are known, for example chelate rings. 30. Triphos sometimes behaves as a bidentate-chelating ligand.