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Determination of Cobalt(II)-EDTA, Cobalt(III)-EDTA, and Cobalt(II) in an Aqueous Solution

Environmental Engineering Program, Dep. of Civil Engineering, Univ. of Maryland, College Park, MD 20742.

^* Corresponding author (apdavis{at}eng.umd.edu).

ABSTRACT

The determination of Co-EDTA species is critical to the understanding of radionuclide migration in the environment, as well as determining efficiencies of various complexed-Co treatment technologies. A new, simple column-oxidation separation methodology was devised to determine the fraction of uncomplexed Co(II), Co(II)-EDTA, and Co(III)-EDTA in an aqueous mixture. A Dowex 50W (H⁺) ion-exchange resin, and the oxidative conversion of residual Co(II)-EDTA to Co(III)-EDTA using H₂O₂, allowed the separation of species fractions. Only atomic absorption spectrophotometric measurements were required after separation of the fractions. Analysis of individual Co species separated from mixtures ranging in concentration from 3 x 10^–5 to 3 x 10^–3M total Co resulted in average recoveries of 97 ± 4%.