Abstract：The nickel oxide sample was dissolved with hydrochloric acid. Co 240.72 nm, Cu 324.75 nm, Zn 213.86 nm, Fe 248.33 nm, Ca 422.67 nm and Mg 202.58 nm were used as the analytical lines. Three pixels were selected for cobalt, copper, zinc and iron, while nine were selected for calcium and magnesium. Consequently, a simultaneous determination method of cobalt, copper, zinc, iron, calcium and magnesium in nickel oxide was established by continuum source flame atomic absorption spectrometry(CS-AAS). The results showed that the influence of determination medium (hydrochloric acid with volume fraction of 2%) on test elements could be eliminated by adding 2 mL of 200 g/L strontium chloride solution into 100 mL of test solution. The interference of matrix nickel could be ignored. Under the optimized experimental conditions, the correlation coefficients of calibration curves for cobalt, copper, zinc, iron, calcium and magnesium were all not less than 0.999 0. The detection limits of method were between 0.002 μg/mL and 0.092 μg/mL. The content of cobalt, copper, zinc, iron, calcium and magnesium in nickel oxide sample was determined parallelly according to the experimental method for 11 times. The determination results of calcium and magnesium were between 0.1% and 0.4%, and the corresponding relative standard deviations (RSDs, n=11) were not more than 2%. The determination results of cobalt, copper, zinc and iron were between 0.003% and 0.04%, and the corresponding RSDs were less than 10%. The proposed method was applied for the determination of the above elements in nickel alloy certified reference materials of electron tube for spectral analysis (exist in nickel oxide state). The results were consistent with the certified values.
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