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

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Abstract

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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Acknowledgements

The authors would like to thank Professor Eugenijus Norkus (Institute of Chemistry, Vilnius) for providing electroless copper-plating bath samples used in this study.

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Authors and Affiliations

  1. Department of Analytical and Environmental Chemistry, Vilnius University, Naugarduko 24, 2006 Vilnius, Lithuania

    Evaldas Naujalis & Audrius Padarauskas

  2. Department of Chemistry, Vilnius Pedagogical University, Studentu 39, 2034 Vilnius, Lithuania

    Audrius Padarauskas

Authors
  1. Evaldas Naujalis
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  2. Jurgita Čepytė
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  3. Audrius Padarauskas
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Correspondence to Audrius Padarauskas.

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Naujalis, E., Čepytė, J. & Padarauskas, A. Speciation of Co(II), Co(III), and Cu(II) in ethylenediamine solutions by capillary electrophoresis. Anal Bioanal Chem 376, 759–762 (2003). https://doi.org/10.1007/s00216-003-1960-8

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  • DOI: https://doi.org/10.1007/s00216-003-1960-8

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