多壁碳纳米管修饰丝网印刷电极同时检测水中苯二酚异构体的研究

采用丝网印刷技术和滴涂法制备了一种可抛型的多壁碳纳米管修饰丝网印刷电极，并将其用于水中的对苯二酚、 邻苯二酚和间苯二酚等苯二酚异构体的同时检测.苯二酚在此修饰电极上的循环伏安行为考察显示，该电极可较好地区分3种异构体的氧化峰，对其氧化还原反应有明显的电催化作用；以差示脉冲伏安法检测对苯二酚、 邻苯二酚和间苯二酚的混合水样，其峰电流与浓度分别在8.20×10^-6～1.00×10^-3、 8.20×10^-6～1.00×10^-3和1.64×10^-5～1.16×10^-3 mol·L^-1范围内呈良好的线性关系，检出限分别达4.34×10^-6、 3.42×10^-6和6.70×10^-6 mol·L^-1；对污染水样进行测定，加标回收率为96.2%～104.9%.研究结果表明，多壁碳纳米管修饰的丝网印刷电极可用于苯二酚异构体污染水样的现场快速检测.

Investigation on Simultaneous Determination of Dihydroxybenzene Isomers in Water Samples Using Multi-Walled Carbon Nanotube Modified Screen-Printed Electrode

A disposable electrode, multi-walled carbon nanotube modified screen printed electrode (MWCNT/SPE), had been fabricated using screen printing technology and drop-coating method to determine dihydroxybenzene isomers (hydroquinone, catechol and resorcinol). The cyclic voltammetry behavior of dihydroxybenzene isomers had been investigated with the MWCNT/SPE. The results reveal that MWCNT/SPE, which shows a strong electrocatalytic activity for the oxidation of dihydroxybenzenes, can entirely separate the oxidation peaks of them. According to differential pulse voltammetry tests, the peak currents of dihydroxybenzene isomers are linear to their concentrations at the range of 8.20×10^-6-1.00×10^-3, 8.20×10^-6-1.00×10^-3 and 1.64×10^-5-1.16×10^-3 mol·L^-1, with the detection limits of 4.34×10^-6, 3.42×10^-6 and 6.70×10^-6 mol·L^-1 for hydroquinone, catechol and resorcinol, respectively. For the determination of dihydroxybenzene isomers in water samples, the value of recovery found by standard addition method was in the range of 96.2%-104.9%. These results indicate MWCNT/SPE can be applied to rapid in-situ determination of dihydroxybenzenes-polluted water samples.