H-point standard addition method in the analysis by differential pulse anodic stripping voltammetry Simultaneous determination of lead and tin

摘要

The applicability of H-point standard addition method(HPSAM)to the resolving of overlapping differential pulse anodic stripping voltam-metric peaks corresponding to the oxidation of lead and tin is verified.The results show that the H-point standard addition method is suitable for the simultaneous determination of lead and tin in aqueous media.The results of applying the H-point standard addition method showed that Sn~(2+)and Pb~(2+)could be determined simultaneously with the concentration ratios of Sn~(2+)to Pb~(2+)varying from 1:5 to 10:1 in the mixed sample.The proposed method has been successfully applied to the simultaneous determination of lead in the presence of tin in some synthetic samples.Moreover,the applicability of the method was demonstrated by the recovery of lead in a canned soft drink sample.