Abstract：Copper magnetite was an important raw material for the smelting of copper and iron. The content of harmful element in copper magnetite, i.e., sulfur, was relatively high. The sample was digested by reverse aqua regia. After volatilizing silicon by hydrofluoric acid and further oxidization by perchloric acid, the content of sulfur in high-sulfur copper magnetite was determined by inductively coupled plasma atomic emission spectrometry (ICP-AES) in nitric acid system with S 182.034nm as the analytical line. The calibration curve was prepared with standard solution series which were matched with iron matrix to eliminate the influence of matrix effect. When the mass concentration of sulfur was in range of 0.10-150μg/mL, it showed good linear relationship with the corresponding emission intensity. The linear correlation coefficient was 0.9998. The detection limit of method was 0.0135%. The proposed method was applied for the determination of sulfur in five content levels of high-sulfur copper magnetite samples. The relative standard deviations (RSD, n=11) of the determination results were between 2.1% and 3.7%, which had no significant difference with the results obtained by high frequency combustion infrared absorption method. The standard deviation of repeatability of method was Sr=0.0135x+0.0143. The repeatability limit was r=0.0379x+0.0396. The standard deviation of reproducibility was SR=0.0232x+0.0137. The reproducibility limit was R=0.0653x+0.0383.
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