基于纳米铂修饰电极的电化学法测定对苯二酚  

Electrochemical determination of hydroquinone based on nanoplatinum modified electrode

作　　者：霍燕燕[1] 雪瑶 武江艳 韩权[1] HUO Yanyan;XUE Yao;WU Jiangyan;HAN Quan(School of Chemical Engineering,Xi’an University,Xi'an 710065)

机构地区：[1]西安文理学院化学工程学院,西安710065

出　　处：《分析试验室》2020年第10期1199-1202,共4页Chinese Journal of Analysis Laboratory

基　　金：陕西省自然科学基金(2020JQ-886);西安市科技计划项目(2020KJWL24,2019KJWL13);2020年大学生创新项目(2902170146);陕西省教育厅专项科研计划项目(18JK1152)资助。

摘　　要：利用5-(5-氰基-2-吡啶偶氮)-2,4-二氨基甲苯(5-CN-PADAT)与Pt(IV)生成稳定的络合物,采用循环伏安法,扫描电位范围为-1.35^-0.35 V,沉积35圈,制备了Pt NPs-5-CN-PADAT修饰电极。采用X射线粉末衍射法、场发射扫描电镜对其进行了表征,并研究了对苯二酚在该电极上的电化学行为。结果表明:在p H 2.0的磷酸盐缓冲溶液中,对苯二酚在该修饰电极上产生一对明显的氧化还原峰。基于此建立了一种测定对苯二酚的电化学传感新方法,对苯二酚浓度在3~100μmol/L范围内与峰电流呈线性关系,检出限为0.103μmol/L。方法用于实际样品的分析,回收率为97.0%~114.8%。A stable complex was formed by 5-(5-cyano-2-pyridylazo)-2,4-diaminotolmuene(5-CN-PADAT)and platinum(IV).Subsequently,the Pt NPs-5-CN-PADAT modified electrode was prepared by using cyclic voltammetric method to deposit 35 cycles with a scanning potential range of-1.35-0.35 V.The morphology and composition of the modified electrode were characterized by X-ray diffraction and scanning electron microscope(SEM),and the electrochemical behavior of hydroquinone on the modified electrode was studied.The results showed that hydroquinone produced a pair of obvious redox peaks with the modified electrode in the phosphate buffer solution(pH 2.0).Based on this fact,an electrochemical sensing strategy was proposed for the determination of hydroquinone.A linear relationship between the peak currents and the hydroquinone concentration from 3 to 100μmol/L was obtained,and the detection limit was 0.103μmol/L.The method was successfully applied in actual samples with the recoveries from 97.0%to 114.8%.

关 键 词：电化学 纳米铂/GCE修饰电极 对苯二酚 纳米传感器 

分 类 号：O657.1[理学—分析化学]