Abstract：The analysis method of lead in lead-tin alloy by precipitation separation-EDTA titration was established. The sample was dissolved with sulfuric acid. In presence of tartaric acid, the lead was translated to lead sulfate and separated from tin. Then, the lead sulfate was converted to lead acetate. The content of lead was determined by EDTA titration in HAc-NaAc buffer solution at pH5.5 and using xylenol orange as indicator. The proposed method was applied to the determination of actual sample, and the results were consistent with the certified values or those obtained by other methods. The recoveries were between 98 % and 101 %. In precision test, the relative standard deviation (RSD, n=9) of two actual sample was 0.13 % and 0.14 %, respectively. This method was simple and fast, and it was applicable for the determination of lead in lead-tin alloy.
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