So far, mercury membrane electrodes have been widely used in the potential window width of the negative potential range, and can be used to quantitatively detect trace amounts, ultra-trace heavy metal ions and biochemical substances with electro-oxidation-reduction characteristics in environmental samples. . Mercury on the surface of a glassy carbon mercury film electrode (GC / MFE) or a metal mercury film electrode is often due to different distribution states. The amount of mercury supported on the membrane will be depleted as the number of measurements increases, affecting the repeatability of the measured data and the analysis results. Reproducibility. Try to improve the assembly of mercury film by different methods, construct a chemically modified composite mercury film electrode and use it for the determination of trace heavy metals. It is effective to use a polynuclear cyanide bridge inorganic conductive polymer as the inner membrane modified layer. One of the means. Prussian blue (PB) material of inorganic polynuclear transition metal cyanide bridge compound with redox electron pair containing [Fe(CN)6]3 - /[Fe(CN)6]4 - excellent electron transport ability 3. The three - dimensional network structure of organic polymer, good chemical stability, simple preparation and low cost. Based on the glass-carbon-based electrode (GC), a composite mercury film electrode with cerium ion and cobalt ion doping Prussian blue was prepared and compared with the mercury plating film directly on the substrate surface (GC/MFE). The stability, sensitivity and anti-organic coexisting ability are obviously improved, and it can be applied to the new composite mercury film electrode for the determination of trace Pb2 +.
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