用石墨粉填充AS树脂、挤出成型制备了石墨-AS复合导电材料电极.电极具有较好的导电性、机械强度和操作稳定性,在多种底液中具有比玻碳电极更高的氢过电压值和小的残余电流.电极成功地用于Cu、In、Pb、Ag的测定并显示较好的选择性、稳定性和再现性;并可采用浸涂法方便地进行甲基蓝修饰,得到具有稳定电化学活性的修饰电极
The graphite AS composite electrodes, which show high electric conductivity, high mechanical strength and operationl stability, were prepared by filling and extruding the AS copolymer with graphite powder. It exhibited a substantial hydrogen overvoltage and small residual current in different electrolytes, as compared with glassy carbon electrode. The electrode was applied to the determination of traces of Pb 2+ in mineral water, Ag + in waste water and In 3+ , Cu 2+ , Pb 2+ , Cd 2+ in zinc ore, and showed high stability, reproducibility and selectivity. Owing to the existence of abundant polar functioal groups on the electrode, the electrode shows the good ability to be further modified with methylene blue by a dip coating procedure.
1HoyerB,FlorenceTM,BatleyGE.Applicationofpolymercoatedglassycarbonelectrodesinanodicstrippingvoltammetry.Anal.Chem.,1987,59(13):16082金利通,同威,方禹之.吸附型化学修饰电极在分析化学中的应用.分析试验室,1987,6(8):453徐金瑞,刘斌.聚乙烯醇修饰电极的研制及应用.分析化学,1992,20(5):5274JinruiXu,BinLiu.Preconcentrationanddeterminationofleadionatachitosan-modifiedglassycarbonelectrode.Analyst,1994,119:15995金文,董绍俊.磷钼酸掺杂的聚吡咯薄膜电极的表征.物理化学学报,1994,10(2):1836XuJinrui,ZhuangXiurun.Poly-salicylicacidmodifiedglassy-carbonelectrodeanditsapplication.Talan-ta,1991,38(10):1191