Solvent Extraction of Indium with 3-Hydroxy-2-methyl-1-phenyl-4-pyridone

Abstract

Abstract Extraction behavior of indium has been investigated with 3-hydroxy-2-methyl-1-phenyl-4-pyridone (HMPP) at 25±0.1 °C and an ionic strength of 0.2. The values of the proton-dissociation constants, pKa1 and pKa2, of HMPP were determined spectrophotometrically to be 3.02 and 9.56. The value of the partition coefficient, logKD, of HMPP between 1,2-dichloroethane and water was determined to be 1.35. Indium(III) was extracted into 1,2-dichloroethane by forming a 1 : 3 (metal : ligand) complex with HMPP. The extraction constant, Kex, the overall formation constant, β3, and the distribution constant, KDC, of the indium(III)–HMPP complex were determined, their values being as follows: logKex=2.16, logβ3=32.63, and logKDC=2.26.