Isotachophoretic separation of trivalent metal complexes of some polyaminopolycarboxylic acids in acetone-water solvent

Abstract

The isotachophoretic separation of trivalent metal complexes of some polyaminopolycarboxylic acids in acetone-water solvent has been carried out. The variation of the qualitative index, R_E, obtained by analysis of the isotachopherograms resulted in a classification into two groups: Fe^III, Co^III, In^III and Bi^III complexes, and Al^III, Cr^III and Ga^III complexes. The satisfactory separation of trivalent metal ions was accomplished by employing a polyaminopolycarboxylic acid as the terminating electrolyte. Linear calibration graphs were obtained in the range 2 × 10^–5–2 × 10^–4 mol dm^–3, the injection volume being kept constant at 25 µl.