| L-组氨酸-赤藓红复合膜修饰电极同时检测对苯二酚、邻苯二酚 |
| 摘要点击 1535 全文点击 1032 投稿时间：2014-08-27 修订日期：2014-11-24 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 L-组氨酸 赤藓红 修饰电极 邻苯二酚 对苯二酚 |
| 英文关键词 L-histidine erythrosine modified electrodes hydroquinone catechol |
|
| 中文摘要 |
| 利用循环伏安法制备了L-组氨酸-赤藓红复合膜修饰玻碳电极(L-His-Erythrosine/GCE). 采用扫描电镜(SEM)观察修饰电极的表面形貌结构,并用电化学阻抗谱(EIS)、循环伏安法(CV)表征修饰电极的电化学性能. 在此基础上用差分脉冲伏安法(DPV)研究了对苯二酚(HQ)和邻苯二酚(CC)混合物在该电极上的电催化氧化,结果表明,L-His-Erythrosine/GCE对HQ及CC的电化学氧化具有显著的催化作用,两种异构体在该修饰电极上的氧化过电位明显降低,峰电流显著增大,二者氧化峰电位间隔达108mV,表明制备的修饰电极可用于HQ和CC的同时检测. 在最佳实验条件下,HQ与CC浓度在1.2×10-6~1.1×10-4mol ·L-1范围内与氧化峰电流呈良好线性关系,检出限分别为0.19 μmol ·L-1 (HQ)和0.16 μmol ·L-1 (CC) (S/N=3). 另外,此修饰电极具有较好的重现性和较强的抗干扰能力,将修饰电极用于实际水样品中HQ和CC的测定,其加标回收率分别为99.9%~100.6%(HQ)、99.2%~100.2%(CC). |
| 英文摘要 |
| By using cyclic voltammetry method, L-histidine and erythrosine was electrodeposited on the surface of glassy carbon electrode (GCE) to obtain the modified electrode (denoted as L-His-Erythrosine/GCE). The morphology of L-His-Erythrosine/GCE was characterized by scanning electron microscopy (SEM), and the electrochemical property characterization of L-His-Erythrosine/GCE was investigated using electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) techniques. The electrocatalytic oxidation of hydroquinone (HQ) and catechol (CC) on the modified electrode was discussed by differential pulse voltammetry (DPV) in this study. The L-His-Erythrosine/GCE had shown an excellent electrocatalytic activity for HQ and CC. The oxidation overpotentials of HQ and CC decreased significantly and the corresponding oxidation currents increased remarkably. Due to the large separation of oxidation peak potentials (108 mV), concentrations of HQ and CC can be easily determined simultaneously. Under the optimum conditions, the oxidation peak currents for both HQ and CC increased linearly with the respective concentrations in the 1.2×10-6 to 1.1×10-4mol ·L-1 concentration range, with the detection limits of 0.19 and 0.16 μmol ·L-1 (S/N=3), respectively. Furthermore, the modified electrode exhibited good reproducibility and selectivity. The modified electrode was successfully applied to the simultaneous determination of HQ and CC in actual water samples, the recoveries got by standard addition method were in ranges of 99.9%-100.6% (HQ) and 99.2%-100.2% (CC). |
|
|
|
