Abstract
A previously described method for the determination of microgram quantities of cobalt in biological material with diphenylthiocarbazone (dithizone) has been modified to allow the quantitative extraction of cobalt from other metals, with 1-nitroso-2-naphthol as the complexing agent. The effect of reagent concentration and the optimal pH range for the extraction are presented. The determination is completed spectrophotometrically by means of the cobalt-nitroso-R salt complex.
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