基于3-巯基丙磺酸膜修饰金电极无线传感检测汞离子  

A Wireless Sensor Based on 3-Mercaptopropyl Sulfonic Acid Membrane Modified Gold Electrode for Detection of Hg^(2+)

作　　者：肖情 陈琳 李文锋 杨丽琴 曹忠 于鑫垚 龙姝 何婧琳 肖忠良 XIAO Qing;CHEN Lin;LI Wen-Feng;YANG Li-Qin;CAO Zhong;YU Xin-Yao;LONG Shu;HE Jing-Lin;XIAO Zhong-Liang(Collaborative Innovation of Micro/nano Bio-Sensing and Food Safety Inspection, Hunan Provincial Key Laboratory of Materials Protection for Electric Power and Transportation, School of Chemistry and Biological Engineering,Changsha University of Science and Technology,Changsha 410114,China)

机构地区：[1]长沙理工大学化学与生物工程学院,电力与交通材料保护湖南省重点实验室,微纳生物传感与食品安全检测协同创新中心,长沙410114

出　　处：《分析化学》2018年第12期1886-1894,共9页Chinese Journal of Analytical Chemistry

基　　金：国家自然科学基金项目(Nos.31527803,21275022,21645009);中国科学院科技服务网络STS计划项目(No.KFJ-SW-STS-173)资助.

摘　　要：设计了一种基于3-巯基丙磺酸膜(MPS)修饰金电极的新型无线传感装置,此装置采用远程控制,通过无线电子发射模块与接收模块传输电位量测数据,实现了对Hg^(2+)的远程超灵敏监测。采用扫描电子显微镜、X-射线光电子能谱、电化学阻抗谱与循环伏安等方法表征了MPS膜电极响应Hg^(2+)前后的表面特性,发现含有末端磺酸基的MPS膜通过静电吸附作用识别结合Hg^(2+),这是由于形成了双电层结构而产生膜电位变化。在pH 6.0的Tris-HCl缓冲溶液中,此电极对Hg^(2+)的线性响应范围为1.0×10^(-8)～1.0×10^(-3)mol/L,响应斜率为59.08 mV/(-pC)(25℃),检出限为8.3 nmol/L。且此膜电极响应快,响应时间为8 s,具有良好的稳定性、重现性和选择性。将此装置用于实际水样中微量汞离子含量的无线测定,回收率为93.7%～101.9%,表明其在环境水质实时监测领域有良好的应用前景。A novel wireless sensing device was designed by adopting remote controlling procedure through wireless electronic transmitting/receiving modules for acquiring potential data based on 3-mercaptopropanesulfonic acid (MPS) modified gold electrode,which could be applied to remote ultrasensitive monitoring of Hg^2+. The surface properties of MPS membrane electrodes with Hg^2+combined and uncombined were characterized by means of SEM,XPS,electrochemical impedance spectroscopy and cyclic voltammetry,indicating that the MPS containing the terminal of sulfonic group exhibited good recognition interaction toward Hg^2+ through electrostatic adsorption,which was due to the formation of double electric layer resulting in change of membrane potential. In Tris-HCl buffer solution (pH = 6.0),the MPS membrane electrode had good linear relationship between potential response and Hg^2+concentration in the range of 1. 0 × 10^-8-1.0×10^-3 mol/L with a slope of 59. 08 m V/(-pC) (25℃),and the detection limit was calculated to be 8.31 nmol/L. In addition,the MPS-based wireless sensor displayed fast response time,i. e. 8 s,with good stability,reproducibility and selectivity. This method was successfully used for the determination of Hg^2+ in real water samples with recovery of 93. 7%-101. 9%,showing important application prospects in real-time monitoring of environmental water.

关 键 词：汞离子 3-巯基丙磺酸 电位响应 选择性膜电极 无线传感 

分 类 号：O657.1[理学—分析化学]