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.
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)
出处
《分析化学》
SCIE
EI
CAS
CSCD
北大核心
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.
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
Mercury(Ⅱ)
3-Mercaptopropanesulfonic acid
Potential response
Selective membrane electrode
Wireless sensing
