Abstract
Cobalt in trace amounts in nickel was determined photometrically. The metals were initially converted to the EDTA complexes. Cobalt was then displaced from its EDTA complex by bismuth and extracted into chloroform as the cobalt(III)-PAN complex. The nickel was masked kinetically as the EDTA complex. In the extract, small amounts of the PAN complexes of nickel and bismuth were destroyed by an acid treatment and cobalt was determined photometrically. The method is highly accurate, reliable, and applicable to parts per million of cobalt in nickel or, with a concentration step included, to parts per 10 million. No interferences were encountered from foreign ions at the levels expected in high-purity nickel. Several characteristics of the analytical system have been exploited to attain the selectivity and sensitivity: the high stability, robust nature, large absorptivity, and the wavelength of the absorbance miximum of the cobalt(III)-PAN complex, and the low reaction rate of the nickel-EDTA complex at room temperature.
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