【摘要】 采用循环伏安法在玻碳电极上通过电化学聚合制备了聚对氨基苯磺酸修饰玻碳电极(PABSA/GCE)。与裸玻碳电极相比,在pH 5.0的磷酸盐缓冲溶液中,抗坏血酸在0.069V产生一个灵敏的氧化峰,表明修饰电极对抗坏血具有明显的电催化氧化作用。在优化的试验条件下,抗坏血酸的质量浓度在1.2~320mg·L-1范围内与氧化峰电流呈线性关系,检出限(3S/N)为0.4mg·L-1。以维生素C片作为基体用标准加入法做回收试验,测得结果在98.1%~105%之间。更多还原

【Abstract】 Poly-p-aminobenzene sulfonic acid was modified on glassy carbon electrode by cyclic voltammetric electropolymerization,which was abbreviated as PABSA/GCE.In comparison with the bare GCE,a significant oxidation peak of ascorbic acid at the modified electrode in PBS of pH 5.0was observed.It was found that the modified electrode exhibited excellent electrocatalytic responses towards the oxidation of ascorbic acid.Under the optimized conditions,linear relationship between values of oxidation peak current and mass concentration of ascorbic acid was kept in the range of 1.2-320mg·L-1 with detection limit(3S/N)of 0.4mg·L-1.Test for recovery was made by standard addition method using VC tablets as matrix,giving results in the range of 98.1%to 105%.更多还原