喹吖啶酮修饰微孔电极电致化学发光检测铜离子  

Electrochemiluminescence detection of Cu^(2+) by quinacridone-modified microporous electrodes

作　　者：张通凯 刘凤玉[1] 宁洪侠 陈萌 李福胜 ZHANG Tongkai;LIU Fengyu;NING Hongxia;CHEN Meng;LI Fusheng(School of Chemical Engineering Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学化工学院,大连116024

出　　处：《分析试验室》2022年第12期1538-1544,共7页Chinese Journal of Analysis Laboratory

基　　金：国家自然科学基金(22172011,22078049)项目资助。

摘　　要：以喹吖啶酮(QA)为发光母体,2,6-吡啶二羧酸(PDC)为吸附基团,合成有机染料QA-PDC2。将该染料修饰在微孔氧化铟锡(ITO)电极表面,制备了一种新型的电致化学发光(ECL)电极。研究发现,在pH 7.0,共反应剂K_(2)S_(2)O_(8)浓度为0.08 mol/L时,ITO/QA-PDC2电极可以发出较强的ECL信号。在此条件下加入Cu^(2+)后,该传感器的ECL强度明显降低,且与Cu^(2+)浓度的对数值在1×10^(-8)~1×10^(-5)mol/L范围内具有良好的线性关系,其相关系数(R^(2))为0.9944,检出限(LOD)为3.8×10^(-8)mol/L。采用标准加入法评价该方法的实用性,回收率为98.8%~101.5%,相对标准偏差(RSD)均小于4.5%。An organic dye QA-PDC2 was synthesized with quinacridone(QA)as the luminescent precursor and2,6-pyridinedicarboxylic acid(PDC)as the anchoring group.The QA-PDC2 was modified on the surface of microporous indium tin oxide(ITO)electrode to prepare a novel electrochemiluminescence(ECL)electrode.I was found that the ITO/QA-PDC2 electrode emitted a strong ECL signal at pH 7.0 with co-reactant of K_(2)S_(2)O_(8)(0.08 mol/L).After adding Cu^(2+),the ECL intensity of the sensor was significantly reduced,and the logarithm of the Cu^(2+)concentration had a good linear relationship in the range from 1×10^(-8)to 1×10^(-5)mol/L with a correlation coefficient(R^(2))of 0.9944 and a low limit of detection(LOD)of 3.8×10^(-8)mol/L.The standard addition method was used to evaluate the practicality of the method,and the recovery rates were 98.8%-101.5%with the relative standard deviations(RSDs)less than 4.5%.

关 键 词：喹吖啶酮 电致化学发光 定量检测 铜离子 

分 类 号：O657.1[理学—分析化学] X832[理学—化学]