Abstract：Indium content in regenerated zinc material is an important index for trade settlement. It is of great significance to accurately determine the content of indium in regenerated zinc material. The sample was dissolved in ammonium fluoride-nitric acid-perchloric acid system. In 10% (volume fraction) nitric acid medium, the determination method of indium with mass fraction of 0.02%-2.0% in regenerated zinc material by flame atomic absorption spectrometry (FAAS) was established using air-acetylene as flame and 303.9 nm as determination wavelength. The interference of coexisting elements in sample on the determination was investigated. The results showed that the influence of silicon on the dissolution effect could be eliminated by using ammonium fluoride to dissolve the sample. The hydrochloric acid-nitric acid-perchloric acid system followed by hydrobromic acid and sulfuric acid smoking could effectively eliminate the interference of impurities such as arsenic, antimony and tin, and meanwhile avoid the loss of indium. The linear range was 1-12 μg/mL with correlation coefficient of 0.999 9. The limit of detection of method was 0.059 μg/mL, and the limit of quantification was 0.20 μg/mL. The experimental method was applied for the determination of indium in regenerated zinc material, and the found 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 0.92% and 4.3%, and the spiked recoveries were between 95% and 105%.
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