Abstract
The complexation equilibria of l-cystine, H2L, with the Cu2+, Al3+, and Fe3+ ions have been studied at 25 °C and in 3 mol·dm−3 NaClO4 ionic medium by potentiometric measurements with a glass electrode. The concentrations of ligand (CL) and metal ions Mz+ (CM) were varied between (0.5·10−3 and 5·10−3) mol·dm−3, and the ligand-to-metal ratio was varied between 1 and 10 (1 ≤ CL/CM ≤ 10). The hydrogen ion concentration was decreased stepwise to the incipient precipitation of a basic salt of each metal. The experimental data have been explained with the formation of the complexes: CuL, CuL22−, Cu(HL)2, and Cu2(HL)3+; AlL+ and AlL2−; and FeL+ and FeL2−. Equilibrium formation constants are given for the investigated ionic medium as well as for the infinite dilution reference state, evaluated by the specific ion interaction theory (SIT).
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