化学学报 ›› 1983, Vol. 41 ›› Issue (10): 927-933. 上一篇    下一篇

研究论文

利用碘离子增感效应和金电极导数阳极溶出法研究铜丶铅和镉的同时测定

崔春国   

  1. 中国科学院环境化学研究所
  • 发布日期:1983-10-15

A study of simultaneous determination of copper, lead and cadmium on gold electrode with enhancement effect of iodide ion by dasv

CUI CHUNGUO   

  • Published:1983-10-15

关键词: 金, 铜, 镉, 铅, 阳极溶出伏安法, 金属电极, 碘离子

A method of simultaneous determination of copper (II), lead (II) and cadmium (II) in sulphuric acid-iocide ion medium was established by derivative anodic stripping voltammetry (DASV) on the gold electrode. The peak theights of lead and cadmium were increased by enhancement effect of iodide ion and the peaks of bismuth and copper were well formed and completely resolved on gold electrode in the presence of iodide ion, therefore peak of copper is not affected by bismuth. The sensitivities for copper, lead and cadmium were very high and their peak potentials in the stripping voltammogram were +0.25, -0.2 and -0.27 volt, respectively. The dependence of peak height of these elemets on their concentrations was linear. The detection limits for copper, lead and cadmium were 0.2 0.2 and 0.05 ppb, respectively. We have further studied the electrode process by means of triangle cyclic voltammetry and proved that he electrode reaction of copper is reversible, and that the reversibility of electrode reactions of lead and cadmium is not good.

Key words: GOLD, COPPER, CADMIUM, LEAD, ANODIC-STRIPPING VOLTAMMETRID METHOD, METAL ELECTRODE, IODIDE ION

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