Zhai Jingying, Yang Liyuan, Du Xinfeng, Xie Xiaojiang
Department of Chemistry , Southern University of Science and Technology , Shenzhen , 518055 , China.
Anal Chem. 2018 Nov 6;90(21):12791-12795. doi: 10.1021/acs.analchem.8b03213. Epub 2018 Oct 12.
Optical ion sensors normally have a relative narrow sensitive detection window. Here, based on multicolor light-emitting diodes (LEDs), we report on an electrochemical-to-optical signal transduction scheme under chronoamperometry control to convert the potentiometric response of ion-selective electrodes (ISEs) to optical output with tunable sensitivity and much wider response range. The sensing principle was demonstrated on K, Ca, and Pb. LED light intensity was found to depend linearly on the concentration of monovalent ions. Optical signals could be captured with photomultiplier tubes or digital cameras, and a visual alarming system to monitor abnormal ion concentration was also developed from super-Nernstian electrodes.
光学离子传感器通常具有相对较窄的灵敏检测窗口。在此，基于多色发光二极管（LED），我们报道了一种在计时电流法控制下的电化学至光学信号转导方案，以将离子选择性电极（ISE）的电位响应转换为具有可调灵敏度和更宽响应范围的光学输出。在钾、钙和铅上验证了传感原理。发现LED光强度与单价离子浓度呈线性关系。光学信号可用光电倍增管或数码相机捕获，并且还从超能斯特电极开发了一种用于监测异常离子浓度的视觉报警系统。
