Abstract：Indium in lead-zinc smelting dust existed in the form of indium sulfide, indium oxide and indium sulfate. The samples were separated with proper reagents. Then, the content of indium in indium sulfide, indium oxide and indium sulfate was determined by inductively coupled plasma atomic emission spectrometry (ICP-AES). Compared to the classical extraction-atomic absorption spectrometry (AAS), polarography and colorimetric method, the proposed method was rapider and more accurate. The selective solvent for each phase, the dosage of solvent, the dissolution condition of sample, the analytical line of elements, the parameters of instrumental operation, the matrix effect, the influence and elimination of interference were discussed. In addition, the treatment and determination conditions of samples were optimized. The interference was effectively eliminated by matrix matching and off-peak background deduction. The determination results were verified using the certified reference materials prepared by high-purity reagents. The found results of indium in each component were consistent with the added values. The linear range of method was 0.0-100 mg/L. The detection limit of indium was 0.072 mg/L. The phase analysis of indium in several lead-zinc smelting dust samples was conducted. The content of indium in the form of indium oxide, indium sulfide, indium sulfate and other phases was equivalent to the total indium content. The relative standard deviations (RSDs) of total indium, indium oxide, indium sulfide and indium sulfate were between 0.96% and 7.1%. The recoveries were between 88% and 113%. The found results of actual samples were consistent with those obtained by extraction-AAS method. The proposed method was practical, rapid and applicable for the phase analysis of indium in large amounts of samples.
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