Abstract：After precipitation separation by ammonium sulphate-ammonium hydroxide, the content of zinc in the solution was determined by EDTA complexometric titration. Simultaneously, after the precipitate was dissolved with hydrochloric acid, the content of the adsorbed zinc in the precipitate was determined by atomic absorption spectrometry. The sum of the both above was the total content of zinc in the sample. Consequently, a novel method for determination of zinc in polymetallic ore was proposed by the combination of EDTA titration and flame absorption spectrometry, which overcame the adsorption of zinc by flocculent colloidal precipitation fundamentally. The experiments showed that in the ammonia medium, the precipitation of iron and manganese and other elements could adsorb zinc in the solution, leading to a lower determination result, and lead, cadmium also affected the determination of zinc. This method was applied to determine zinc in lead zinc ore and zinc concentrate certified reference materials. The results were in accordacnce with the certified values, and the relative standard deviations (RSDs) were less than 0.4%.
