【摘要】 制备了超支化聚(胺-酯)化学修饰碳糊电极,研究了Cu2+在修饰电极上的电化学行为。在0.25mol/LKCl溶液(pH4.0)中,Cu2+与超支化聚(胺-酯)形成电化学包络物,分别于0.27和0.06V处产生一对灵敏的氧化还原峰,具有明显的催化还原增敏作用。研究了超支化聚合物结构和代数对电极性能的影响。实验表明:5代超支化聚合物修饰电极性能最好。建立了线性扫描伏安法测定痕量铜的方法,线性范围1.0×10-8～3.0×10-5mol/L;检出限为4.0×10-9mol/L。用于人发样品的测定,获得满意结果。更多还原

【Abstract】 Hyperbranched polymer modified carbon paste electrodes(HBP/CPE) were prepared.The electrochemical behavior of Cu(Ⅱ) on the HBP/CPE electrode was studied.In the solution of 0.25 mol/L KCl(pH 4.0),an electroactive complex of Cu(Ⅱ) with poly(amine-ester) was formed and produced a redox peak at 0.27 V and 0.06 V.The HBP/CPE electrode showed good catalytic activity and sensitizing effect for the reduction of Cu(Ⅱ) in the KCl solution.The investigation of the effect of structure and generation number of hyperbranched polymer on the capability of modified electrode indicates that HBP5/CPE electrode was the highest sensitizing effect.The detection limit and the linear range of the concentration of Cu(Ⅱ) to the reduction peek current were 4.0×10-9 mol/L and 1.0×10-8-3.0×10-5 mol/L,respectively.Linear sweep voltammetry has been applied to the determination of micro Cu(Ⅱ) in human hair with satisfactory results.更多还原