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提出了一种新颖的同位镀铋膜过氧化聚乙酰苯胺修饰的玻碳电极(Bi/over-oxidized PNAANI/GCE)方波溶出伏安法(SWASV)同时检测食用盐中Cd(Ⅱ)和Pb(Ⅱ)的方法.过氧化聚乙酰苯胺膜具有良好的阳离子选择通透性,大大改善了修饰电极检测重金属时的灵敏度和选择性.同位镀铋膜可以作为汞膜的替代物,用于提高修饰电极对Cd(Ⅱ)和Pb(Ⅱ)的富集能力.Cd(Ⅱ)和Pb(Ⅱ)的分析曲线均覆盖了两个线性范围:0.2～3.0μg·L-1和3.0～33μg·L-1,在富集时间为300s时,Cd(Ⅱ)和Pb(Ⅱ)检测限分别为0.015μg·L-1和0.029μg·L-1.此外,这种修饰电极还具有很高的稳定性和抗干扰性能.最后,该修饰电极被成功地应用于食用盐样品中Cd(Ⅱ)和Pb(Ⅱ)的同时测定.
A novel Bi-over-oxidized PNAANI / GCE (Square Wave Stripping Voltammetry) method for simultaneous determination of Cd (Ⅱ) and Pb (Ⅱ) .The peroxidation of polyaniline film has good cation selective permeability, greatly improving the sensitivity and selectivity of the modified electrode for detecting heavy metals.Co-plating bismuth film can be used as an alternative to mercury film, used to improve The analytical curves of Cd (Ⅱ) and Pb (Ⅱ) covered two linear ranges: 0.2 ~ 3.0μg · L-1 and 3.0 ~ 33μg · L-1, the detection limits of Cd (Ⅱ) and Pb (Ⅱ) were 0.015μg · L-1 and 0.029μg · L-1 respectively when the enrichment time was 300s.In addition, the modified electrode also had high Stability and anti-interference performance.At last, the modified electrode was successfully applied to the simultaneous determination of Cd (Ⅱ) and Pb (Ⅱ) in edible salt samples.