微分电位溶出法直接测定食醋中铅的含量

Determination of Pb content in vinegar by differential potentiometric stripping method

采用微分电位溶出法对食醋中铅的含量进行直接测定,确定最佳条件为:介质采用0.1mol/L的盐酸,富集电位为-1.1 V,清洗电位为-0.05 V,电位上限-0.8 V,电位下限-0.2 V,富集时间为100 s.此法的应用测试结果令人满意.

The Pb content in vinegar was determined by differential potentiometric stripping method. The optimum conditions were as follows：medium was 0.1 mol/L HC1, deposition potential of - 1.1 V,wash potential of - 0.05 V,the potential limit from - 0.2 V to - 0.8 V,deposition time of 100 s. The method has been used to determine lead in vinegar with satisfactory results.