Abstract
Traces of cobalt in sea water have been preconcentrated by anion-exchange from acidified sea water in the presence of thiocyanate. Cobalt adsorbed on the resin column is stripped by elution with 2 M perchloric acid. Accompanying iron is removed subsequently by anion-exchange from 6 M hydrochloric acid medium. Cobalt in the eluate is determined spectrophotometrically with 4-(2-pyridylazo)resorcinol in the presence of EDTA and potassium cyanide. The anion-exchange — PAR method allows to determine cobalt very selectively in sea as well as non-saline waters on a 2 l sample basis. The method gives a coefficient of variation of ca. 10% at a cobalt level of 0.1–0.2 Μg per liter.
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