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制备了双硫腙修饰的玻碳电极,利用阳极溶出伏安法并通过超声波富集测定痕量重金属离子Hg~(2+)。Hg~(2+)与电极表面的双硫腙通过螯合作用而被富集在电极表面,在-1.20 V时还原成Hg0,当电极电势从-0.50 V到0.70 V扫描时,被还原为单质的Hg0从电极表面溶出,在0.20 V左右形成灵敏的阳极溶出峰。选择0.1 mol/L的Na Cl溶液为支持电解质并对pH、富集时间、富集电位、双硫腙的修饰量等参数进行优化。在优化条件下,Hg~(2+)浓度为5.0×10~(-8)~2.0×10~(-4)mol/L时与溶出峰电流呈现良好的线性关系,检出限为1.1×10~(-8)mol/L,重现性良好,可用于水样中痕量重金属离子Hg~(2+)的快速检测。
Dithizone modified glassy carbon electrode was prepared. The trace heavy metal ion Hg 2+ was determined by anodic stripping voltammetry and ultrasonic wave enrichment. Dithizone on the surface of Hg 2+ and the electrode is enriched in the electrode surface by chelation and reduced to Hg 0 at -1.20 V. When the electrode potential is scanned from -0.50 V to 0.70 V, the Hg 2+ is reduced to Elemental HgO elutes from the electrode surface and forms a sensitive anodic dissolution peak around 0.20 V. The 0.1 mol / L NaCl solution was used as the supporting electrolyte and the parameters such as pH, enrichment time, enrichment potential and the amount of dithizone modification were optimized. Under the optimum conditions, the peak current of the sample was linear with the concentration of 5.0 × 10 -8 ~ 2.0 × 10 -4 mol / L Hg 2+, the detection limit was 1.1 × 10 ~ (-8) mol / L, good reproducibility, which can be used for the rapid detection of trace heavy metal ions Hg 2+ in water samples.