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研究了聚茜素红膜修饰电极 ( PARE)的制备及其对多巴胺 ( DA)和抗坏血酸 ( AA)的电催化性能 ,结果表明 ,在 PARE上 DA和 AA具有不同的循环伏安行为 ,前者表现为一个准可逆过程 ,后者则为不可逆过程 ,并且二者的氧化峰电位分开近 2 0 0 m V.因此可通过控制不同的电位范围进行分步扫描 ,实现了对同一体系中 DA和 AA的分别测定 ,DA的还原峰电流和 AA的氧化峰电流分别在 8.0× 1 0 - 6 ～ 4 .0× 1 0 - 3 mol/L和 4 .0× 1 0 - 5 ～ 2 .0× 1 0 - 2 mol/L范围内与各自的浓度呈线性关系 ;检测限分别为 8.0× 1 0 - 7mol/L和 1 .0×1 0 - 5 mol/L.同时与导数伏安法一步测定进行比较 ,结果令人满意 .
The preparation of poly (alizarin red film) modified electrode (PARE) and its electrocatalytic activity on dopamine (DA) and ascorbic acid (AA) were studied. The results showed that DA and AA had different cyclic voltammetry behavior on PARE, Is a quasi-reversible process, the latter is an irreversible process, and the oxidation peak potential of the two separated nearly 200m V. Thus can be controlled by different potential range of step-by-step scan to achieve the same system DA and AA , The peak current of reduction of DA and the oxidation peak current of AA are respectively in the range of 8.0 × 10 -6 ~ 4.0 × 10 -3 mol / L and 4.0 × 10 -5 ~ 2.0 × 1 The linear range was between 0 and 2 mol / L and the limit of detection was 8.0 × 10 7 mol / L and 1 × 10 5 mol / L, respectively. Comparison, the result is satisfactory.