Abstract：The content of germanium in the purified solution of zinc hydrometallurgy is low, while the other components are complex. Impurities such as zinc and magnesium will interfere greatly with the determination of trace germanium by spectrophotometry. The salicylfluorone was selected as the chromogenic agent. In hydrochloric acid system, the maximum absorption wavelength of germanium complex at 500 nm was used as the measurement wavelength. The germanium concentration of zinc sulphate solution in zinc plant was determined by standard addition method. In this zinc sulphate solution for the determination of germanium concentration, different amounts of germanium standard solution were added to prepare the calibration curves. A method for the determination of trace germanium in purified solution of zinc hydrometallurgy by salicylfluorone spectrophotometry was established. The interference of impurities such as zinc and magnesium on the determination of trace germanium was effectively eliminated. The zinc sulphate solution from two plants is used as the base solution to establish the calibration curve:(1)When the mass concentration of germanium in sample was in range of 8.1-133.1 μg/L, the absorbance was linear with germanium mass concentration,the correlation coefficient of r was 0.999 9,the apparent molar absorption coefficient was ε=9×104 L·mol-1·cm-1;(2)When the mass concentration of germanium in sample was in range of 9.8-134.8 μg/L, the absorbance was linear with germanium mass concentration,the correlation coefficient of r was 0.999 7, the apparent molar absorption coefficient was ε=8.99×104 L·mol-1·cm-1. The limit of detection (LOD) and limit of quantification (LOQ) was 1.0 μg/L and 3.3 μg/L, respectively. The content of germanium in actual sample of purified solution of zinc hydrometallurgy was determined according to the experimental method. The relative standard deviations (RSDs, n=6) of the determination results ranged from 0.58% to 1.6%, and the spiked recoveries ranged from 98% to 102%. The proposed method could be used for the determination of germanium in various zinc hydrometallurgy purification solutions with low concentration of copper, such as first stage, second stage and third stage purification solution.
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