Speciation of Co(II), Co(III), and Cu(II) in ethylenediamine solutions by capillary electrophoresis

Naujalis, Evaldas; Čepyté, Jurgita; Padarauskas, Audrius
July 2003
Analytical & Bioanalytical Chemistry;Jul2003, Vol. 376 Issue 5, p759
Academic Journal
A capillary electrophoretic (CE) method for the speciation of Co(II), Co(III), and Cu(II) in electroless copper-plating baths containing ethylenediamine (En) has been developed. The method is based on the selective pre-capillary derivatization of Co(II) with 1,10-phenanthroline (Phen) followed by CE separation of stable [CoPhen3]2+, [CoEn3]3+, and [CuEn2]2+ chelates. The proposed derivatization procedure protects Co(II) from oxidation by dissolved oxygen and enables rapid determination of all three metal species within a single run. The optimized separations were carried out in a fused silica capillary (57 cm×75-μm I.D.) filled with an ethylenediamine sulfate electrolyte (20 mmol L–1 H2SO4, pH 7.0 with En, applied voltage +30 kV) using direct UV detection at 214 nm. The detection limits for a signal-to-noise ratio of 3 and 10 s, hydrodynamic injections were 5×10–6 mol L–1 for Cu(II), 1×10–6 mol L–1 for Co(III), and 4×10–7 mol L–1 for Co(II). Application of the method to the speciation of Co(II), Co(III), and Cu(II) in copper-plating bath samples is also demonstrated.


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