Simultaneous determination of seven impurities in high-purity cobalt oxide by ICP-AES after matrix separation using 1-nitroso-2-naphthol as a precipitant

来源期刊：中南大学学报(英文版)2002年第2期

论文作者：王艳 周春山 段青兵 陈萍

文章页码：100 - 103

Key words：trace impurity; high-purity cobalt oxide; matrix separation; inductively coupled plasma atomic emission spectrometry (ICP-AES)

Abstract: Amethod 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 preci-pitation with 1-nitroso-2-naphthol. The matrix effect of cobalton 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 from90% 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.