Abstract：The content of zinc was determined by EDTA titration. When the mass concentration of nickel in solution was higher than 0.25 μg/mL, it showed closing effect on the xylenol orange (XO) indicator, which influenced on the judgment of endpoint. The dimethylglyoxime with double amount of nickel was added into solution for the precipitation separation of nickel. Thus the interference of titration end point by nickel could be eliminated. After separation of nickel, 5 g of potassium iodide into solution was added to mask cadmium. The content of zinc was directly titrated by EDTA standard solution. The titration endpoint was normal. The content of zinc in simulated sample solution was determined according to the experimental method. The recoveries were between 99.02% and 100.24%. The proposed method was applied to the determination of zinc in two materials containing nickel and zinc. The relative standard deviations (RSD, n=11) were less than 1%. The found results were consistent with those obtained by EDTA titration after precipitation separation using sodium hydroxide.
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