Abstract：The EDTA titration method for the major component (lead) in lead raw materials was analyzed. Some key points were discussed, including the acid dissolution mode of sample, formation condition of lead sulfate precipitate, precipitate aging and filtration method, determination of filtrate and insoluble residue, and the calibration of EDTA standard solution. The interference cause and elimination scheme of major coexisting interference elements (such as carbon, silicon, bismuth, barium and antimony) in raw materials were tested and discussed. Due to the complexity of raw materials for lead smelting, the precision requirements of current national standard method were discussed. The influencing factors and corresponding measures were investigated. The results proved that the effect was significant. The proposed method was applied to the analysis of actual sample. The found results were consistent with those obtained by national standard method. This study had certain guiding effect on the improvement of determination accuracy of lead content in smelting raw materials by EDTA titration method.
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