Abstract：When Te in lead-bismuth alloy is reduced by SnCl2, Cl- will react with a large amount of Pb2+ in the solution to produce PbCl2 precipitation, which seriously interferes with the analysis of trace Te. In experiments,a large amount of Pb2+ were removed with HCl. Based on the strong reducibility of SnCl2 in acid medium, the Te4+ in solution could be reduced to Te, which could absorb light at a certain wavelength. Then a determination method of trace Te in lead-bismuth alloy by spectrophotometry was established. The effects of the selection of acid system, the concentration of HCl, the amount of SnCl2 solution, the coloring temperature and the measuring time on the absorbance were discussed. The results showed that the absorbance of coloring system was stable for more than 60 min at 410 nm under the following experimental conditions: 0.4 mL of 0.1 g/mL SnCl2 solution was added into 3 mol/L HCl, and the temperature was kept at 30 ℃ for 15 min. The Beer's law was obeyed for Te in the range of 0.1-50 μg/g. The linear correlation coefficient (r) of calibration curve was 0.999 8. The apparent molar absorption coefficient was 7.16×103 L·mol-1·cm-1. The limit of detection for Te was 0.06 μg/g, and the limit of quantification was 0.20 μg/g. The content of Te in lead-bismuth alloy was determined according to the experimental method. The relative standard deviations (RSD, n = 6) of determination results were between 0.040% and 1.3%. The recoveries were between 97% and 106%. The found results were basically consistent with those obtained by inductively coupled plasma mass spectrometry (ICP-MS).
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