Solvent extraction of trace amounts of cobalt from pure reagent chemicals and its spectrophotometric determination with 2-nitroso-5-dimethylaminophenol

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Abstract
Trace amounts of cobalt in pure reagent chemicals have been determined spectrophotometrically with 2-nitroso-5-dimethylaminophenol. Cobalt in amounts below 0·6 µg in the aqueous phase is extracted into 1,2-dichloroethane (5 ml) at pH 4 to 8. The excess of reagent and metal complexes other than the cobalt complex that are extracted into the organic phase are removed by extraction of the latter with 1 N potassium hydroxide solution followed by hydrochloric acid solution (1 + 2). The organic phase is then filtered through a dry filter-paper, and the absorbance of the organic phase measured in a cell of 50-mm path length at 456 nm. By using the above procedure, trace amounts of cobalt (10–8 to 10–4 per cent.) in sodium, potassium and iron(III) salts, etc., were determined by the standard addition method.

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