Formation constants and composition of Ga3+ and In3+ complexes with iminodisuccinic acid in aqueous solutions according to potentiometric data

The complexation of Ga³⁺ and In³⁺ with iminodisuccinic acid (H₄L) at 25°C in 0.1, 0.4, 0.6, and 0.8 M KNO₃ supporting solutions was studied by potentiometry and mathematical modeling. The thermodynamic constants of formation of neutral, protonated, and hydroxo complexes were calculated by extrapolating the concentration constants to the zero ionic strength using an equation with one individual parameter.