Labelled Ethylenediaminetetraacetic Acid (E917745). EDTA is a powerful chelating agent; EDTA forms stable complexes with most metal ions. EDTA is used in treatment of lead and heavy metal poisoning of farm animals. Ethylenediamine-N,N,N’,N’-tetraacetic Acid (EDTA) is a powerful chelating agent; EDTA forms stable complexes with most metal ions. EDTA is used in treatment of lead and heavy metal poisoning of farm animals.