Abstract：After copper magnetite sample was decomposed with 15 mL of hydrochloric acid, 5 mL of nitric acid, 3 mL of hydrofluoric acid and 5 mL of perchloric acid,a determination method of copper (0.1%-2%) in copper magnetite by flame atomic absorption spectrometry(FAAS) was established with 5%(V/V) perchloric acid as determination medium. The interference tests indicated that the maximum contents of impurities in copper magnetite had no interference with the determination of copper. Under the selected experimental conditions, the correlation coefficient of calibration curve for copper was 0.999 1. The detection limit of method was 0.017 μg/mL. The proposed method was applied for the determination of copper in five copper magnetite samples, and the results were basically consistent with those obtained by inductively coupled plasma atomic emission spectrometry (ICP-AES). The relative standard deviations (RSD, n=11) were between 1.2% and 3.7%. The recoveries were between 96% and 104%. The proposed method was tested in seven laboratories, and the reproducibility limit (R) was in range of 0.020%-0.118%.
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