ITO电极在水中超低水平Cd^(2+)检测中的应用  

The application of ITO electrode in detecting ultra-low-level Cd^(2+)in water

作　　者：李晓龙 陈玉萍 李燕怡 赖厚政 王传发 LI Xiaolong;CHEN Yuping;LI Yanyi;LAI Houzheng;WANG Chuanfa(College of Chemical Engineering and Mordern Materials,Shangluo University,Shangluo 726000,China;Shaanxi Key Laboratory of Tailings Comprehensive Utilization of Resources,Shangluo 726000,China)

机构地区：[1]商洛学院化学工程与现代材料学院,陕西商洛726000 [2]陕西省尾矿综合利用重点实验室,陕西商洛726000

出　　处：《甘肃科学学报》2024年第1期46-51,共6页Journal of Gansu Sciences

基　　金：陕西省教育厅重点科学研究计划项目(21JS024)。

摘　　要：为了检测水质中痕量水平的Cd^(2+),以氧化铟锡(ITO)薄膜电极为工作电极,铂片和饱和甘汞电极(SCE)分别为对电极和参比电极,构建了针对Cd^(2+)的化学传感器。采用差分脉冲伏安法(DPV)对构筑的化学传感器在含Cd^(2+)的乙酸溶液(pH=4.5)中的灵敏度、选择性、检出限和长期稳定性进行了评价。研究结果表明,所构筑的化学传感平台对Cd^(2+)的灵敏度为24.61μA/μmol/L,Cd^(2+)的校准曲线方程为Y=24.61X+11.145,相关系数(R2)为0.994,检出限(LOD)为0.06μmol/L;干扰性实验结果表明,Zn^(2+)、Cu^(2+)、Pb^(2+)、Ag^(+)4种金属离子对Cd^(2+)的检测干扰较小;稳定性实验结果表明,所构建的针对Cd^(2+)的化学传感器具有良好的稳定性;实际水样检测表明,构建的化学传感器可以用来对自来水中Cd^(2+)进行检测。研究显示,所构建的针对Cd^(2+)的化学传感器可以用来检测水质中痕量Cd^(2+)。In order to detect ultra-low-level Cd^(2+)in water,a kind of chemosensor aiming at counter electrode and reference electrode towards Cd^(2+)was constructed by three electrodes system consisting of ITO,Pt sheet as well as SCE as working electrode.Meanwhile,the sensitivity,the selectivity,LOD and long-term stability of the as-constructed chemical-sensor were evaluated in CH 3COOH solution(pH=4.5)existing Cd^(2+)by differential pulse voltammetry(DPV).The results showed that the as-constructed chemical-sensor had good sensitivity of 24.61μA/μmol/L.The calibration equation of Cd^(2+)was Y=24.61 X+11.145,with the relative coefficient(R 2)of 0.994.The limit of detection(LOD)of the as-constructed chemosensor was 0.06μmol/L.The anti-interference studies of existing heavy metal ions Zn^(2+),Cu^(2+),Pb^(2+)and Ag^(+)showed that there was no obvious interfere effect on the measurement of Cd^(2+).Moreover,the results of stability experiment showed that the as-constructed chemosensor had superior stability.Finally,the as-constructed sensor was suitable to determine the concentration of Cd^(2+)in tap water by the analysis of real samples.The results displayed that the as-constructed chemsensor could detect the ultra-low-level Cd^(2+)in water.

关 键 词：Cd^(2+) 差分脉冲伏安法 电化学 灵敏度 

分 类 号：O643[理学—物理化学]