聚曙红Y修饰玻碳电极循环伏安法测定自来水中对苯二酚

Determination of hydroquinone in tap water by cyclic voltammetry with eosin Y polymer film modified glassy carbon electrode

通过电聚合的方法将曙红Y修饰到玻碳电极表面,制备聚曙红Y修饰电极,该修饰电极对对苯二酚具有良好的电催化作用。利用循环伏安法研究了对苯二酚在该修饰电极上的电化学行为,在pH 5.0的乙酸盐缓冲溶液中,扫描速率为100 mV/s时,对苯二酚的浓度在5.0×10^-10~1.8×10^-6 mol/L范围内与其氧化峰电流线性关系良好,检出限为1.25×10^-10 mol/L。该电极测量值重现性相对标准偏差为1.03%~3.50%(n=6),自来水加标样品回收率为102.9%~109.7%。该方法可用于自来水中对苯二酚的测定。

The modified electrode was obtained by electropolymerizing eosin Y on a glassy carbon electrode,which exhibited outstanding electro catalytic activity towards the redox of p-benzenediol.The electrochemical behavior of p-benzenediol was explored by cyclic voltammetry.The peak currents of p-benzenediol showed a good linear relationship with the concentration in the range of 5×10^-10-1.8×10^-6 mol/L at the scan rate of 100 mV/s in acetate buffer solution with pH 5.The detection limit was 1.25×10^-10 mol/L.The relative standard deviation of reproducibility was 1.03%-3.50%(n=6),and the recovery of hydroquinone in standard additional tap water sample was 102.9%-109.7%.The proposed method can be used for determining the content of hydroquinone in tap water.