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Solvent Extraction of Trivalent Indium from Succinate Solution by 2-Octylaminopyridine in Chloroform

S.V. Mahamuni, S.S. Kolekar, P.P. Wadgaonkar^a and M.A. Anuse*

Analytical Chemistry Laboratory, Department of Chemistry, Shivaji University, Kolhapur - 416 004, India
^aPolymer Science and Engineering Division, National Chemical Laboratory, Dr. Homi Bhabha Road, Pune - 411 008, India

Extraction processes of indium(III) with 2-octylaminopyridine (2-OAP) from media of various complexing ability, succinate and salicylate, in chloroform have been elucidated. The ion-pair complex has also quantitative extraction in xylene and 1,2-dichloroethane. Indium(III) from organic phase was stripped with 1.0 M hydrochloric acid and determined complexometrically with EDTA. The stoichiometry of the extracted species was found out on the basis of slope analysis. The extraction of indium(III) proceeds by an anion exchange mechanism and the extracted species is [RR′NH₂⁺In(succinate)₂^-]_(org). Temperature dependence of the extraction equilibrium constant was also examined to estimate the apparent thermodynamic functions (ΔH, ΔG and ΔS)for extraction reaction. It is possible to separate indium(III) from Zn(II), Cd(II), Pb(II), Hg(II), Bi(III), Tl(I), Tl(III), Ga(III), Al(III), Te(IV), Se(IV), Sb(III), Fe(III) and Sn(IV). The method is simple, rapid and reproducible and can be used to determine the indium from samples like alloys.

Keywords: Liquid-liquid extraction, Indium(III), Sodium succinate, 2-OAP, Binary separations