Abstract：In the process of zinc smelting, the content of antimony in zinc concentrate should be rapidly detected in order to prevent the “burning plate” phenomenon.The sample was treated with nitric acid and hydrofluoric acid by microwave digestion. Sulfuric acid was added after digestion to remove hydrofluoric acid with the acid catcher. Sb 217.582nm was selected as the analytical line. The influence of matrix effect was eliminated by preparing calibration curve with matrix matching method. The content of antimony in zinc concentrate was determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). The mass concentration of antimony in range of 0.05-200mg/L was linear to its corresponding emission intensity with correlation coefficient of 0.9996. The detection limit of method was 0.003% (mass fraction, the same below) and the low limit of determination was 0.01%. The content of antimony in zinc concentrate sample was determined according to the experimental method. The relative standard deviation (RSD, n=12) of the determination results was 1.7%. The spiked recoveries were between 98% and 99%. The proposed method was applied for determination of antimony in four zinc concentrate samples, and the found results were consistent with those obtained by hydride generation-atomic fluorescence spectrometry (HG-AFS) or cerium sulfate titration.
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