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Determination of Cobalt(II)‐EDTA, Cobalt(III)‐EDTA, and Cobalt(II) in an Aqueous Solution
Author(s) -
Ayres David M.,
Davis Allen P.
Publication year - 1996
Publication title -
journal of environmental quality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.888
H-Index - 171
eISSN - 1537-2537
pISSN - 0047-2425
DOI - 10.2134/jeq1996.00472425002500060040x
Subject(s) - cobalt , chemistry , aqueous solution , chelation , ion exchange resin , atomic absorption spectroscopy , fraction (chemistry) , nuclear chemistry , chelating resin , ion exchange , inorganic chemistry , chromatography , metal ions in aqueous solution , metal , ion , physics , organic chemistry , quantum mechanics
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 H 2 O 2 , 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 × 10 −5 to 3 × 10 −3 M total Co resulted in average recoveries of 97 ± 4%.