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Determination of lead in zinc oxide leaching residue by EDTA titrimetry

FU Guo-xiu;NIU Qin-xue;DANG Xiao-jie;Shangluo Zinc Smelting Plant of the Shanxi Zinc Industry Co.,Ltd.;  
An analytical method was proposed for the determination of lead in zinc oxide leaching residue with higher iron and silicon by EDTA titrimetry.The sample was dissolved in hydrochloric acid and nitric acid,then ammonium fluoride was added to decompose the silicates and completely dissolve lead enclosed in the silicates.Sulfuric acid was added to form lead sulfate precipitate,which was filtered to separate lead from other coexisting elements liking zinc and iron soluble in sulfuric acid.Acetic acid-sodium acetate buffer solution was used to dissolve lead sulfate and ascorbic acid was added to mask the small amounts of iron.With xylenol orange as the indicator,at pH 5-6,EDTA standard solution was used to titrate the solution into the color of bright yellow as the end.The relative standard deviation of determination results was in the range of 0.23%-0.76% and the average recovery was 100.2%.
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