Simultaneous determination of seven impurities in high-purity cobalt oxide by ICP-AES after matrix separation using 1-Nitroso-2-naphthol (cas 131-91-9) as a precipitant

Add time:10/01/2019    Source:infona.pl

A method was developed for the simultaneous determination of seven trace impurities (Cd, Mn, Pb, Zn, Cu, Fe and Ni) in high-purity cobalt oxide by ICP-AES. The matrix effect was eliminated by precipitation with 1-Nitroso-2-naphthol (cas 131-91-9). The matrix effect of cobalt on the absorptions of trace impurities, the effects of reaction time, pH value, dosage of precipitant on the formation of cobalt-1-nitroso-2-naphthol complex, the effects of hydrochloric acid on the stability of this complex and masking of elements were studied. Recoveries of the impurities in spiked sample are from 90% to 110% with a precision of 1.1%–5.0% RSD. The detection limits of the seven elements are in the range of 0.01–0.24µg/g. The method can be applied to the analysis of high-purity cobalt metal, cobalt oxide and other cobalt compounds.

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