For extraction chloro anion complexes of Cd2+ and Hg2+ used many organic agents as
extractant according to liquid ion exchange method such as α-Naphthyl amine (α-NA), 4-Amino
benzoic acid (4-ABA), 2-[(4-Carboxy methyl phenyl) azo]-4,5-diphenyl imidazole (4-
CM ePADPI) and Cryptand (C222). This study includes definition hydrochloric acid
concentration in aqueous phase and shaking with organic phase necessary for extraction as well
as shaking time, organic solvent effect, interferences and alkaline salt effect. Thermodynamic
showed the ion exchange reaction was exothermic for α-NA, C222 and endothermic for 4-ABA,
4-CM ePADPI for extraction CdCl4
=, but for extraction HgCl4
= was exothermic with 4-ABA, 4-
CM ePADPI and C222 but endothermic with α-NA. In addition stoichiometry showed the ion pair
complex extracted was 1:1:1 Cation: Ligand: Anion.
م.د.صفا مجيد | Dr.Safa Majeed | 5151