Abstract
Cobalt is determined in the presence of large amounts of nickel by masking the latter substoichiometrically by addition of xxx 98% of the theoretically required amount of EDTA. The “free nickel” :cobalt ratio is thereby decreased below the critical value and the cobalt is extracted as the green cobalt(III)-PAN complex into chloroform. Small amounts of nickel-PAN formed are destroyed by a subsequent EDTA-hydrochloric acid treatment. The absorbance of the treated extract is measured at 635 mμ. Copper, zinc, cadmium and iron do not interfere in ratios (to cobalt) of 500:1, 100:1, 100:1 and 10:1, respectively.
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