The use of N,N-bis(hydroxybenzyl)ethylenediamine-N,N-diacetic acid (HBED) for the determination of trivalent metal ions by capillary electrophoresis

The separation of Bi(III), Sc(III), In(III), Co(III), Ga(III), AI(III), Cr( II), Mn(III), and Fe(III) ions with HEED (Figure 1) by an ion exchange vari ant of electrokinetic chromatography was demonstrated. The use of high conc entration of cationic polymer and a careful choice of counter ions added in carrier electrolyte allowed to stretch selectivity scale for the complete baseline resolution of all studied chelates with efficiency 40-300 thousand s theoretical plates. Favorable arrangement of donor groups in HEED structu re made possible the first separation of Ga(III) and In(III) chelates by CE .