Abstract：Indium content in zinc concentrate is an important index for trade settlement. The accurate determination of indium content in zinc concentrate has important guiding significance. The sample was dissolved with hydrochloric acid, ammonium fluoride, nitric acid, and sulfuric acid. A method for determination of indium content in range of 0.002 0%-0.120% (mass fraction, similarly hereinafter) in zinc concentrate was established by flame atomic absorption spectrometry (FAAS) at 303.9 nm with air-acetylene as flame and hydrochloric acid (1+19) as determination medium. The sample dissolution tests showed that the sample with relatively low carbon content could be fully dissolved with 20 mL of hydrochloric acid, 0.2 g of hydrochloric acid, 5 mL of nitric acid, and 5 mL of sulfuric acid. If there was black residue in solution, it indicated that the carbon content in sample was relatively high, and 2 mL of perchloric acid should be further added for sample dissolution. The influence of zinc matrix on determination was investigated. The results showed that the interference of zinc matrix with determination was relatively significant when the mass concentration of zinc matrix was higher than 3.25 mg/mL. The interference of zinc matrix with determination could be ignored when the mass concentration of zinc matrix was not higher than 3.25 mg/mL. For the samples with different indium contents, different treatment methods were used to eliminate the interference of zinc matrix with the determination. When the indium content was high (0.050%-0.120%), the volume of solution after sample dissolution was diluted to twice for direct determination. When the indium content was low (0.002 0%-0.050%), the extraction separation of indium by butyl acetate should be conducted before determination. The interference tests indicated that other coexisting elements in sample did not interfere with determination whether for determination of high content or low content of indium, and the residual sulfuric acid and nitric acid in test solution had no interference with determination. The experimental results showed that the mass concentration of indium in range of 0.50-10.00 μg/mL had linear relationship with its corresponding absorbance. The correlation coefficient was 0.999 7. The limit of detection and limit of quantification was 0.088 μg/mL and 0.29 μg/mL, respectively. The experimental method was applied to the determination of indium in zinc concentrate sample, and the results were consistent with those obtained by spectrophotometry after extraction separation or inductively coupled plasma atomic emission spectroscopy (ICP-AES) for the sample with high content or low content indium, respectively. The relative standard deviations (RSD, n=11) were between 2.1% and 5.2%.
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