A novel electronic tongue was developed for heavy metals analysis in aqueous systems. It contains three micro-electrochemical sensors based on differential pulse stripping voltammetry (DPSV). One side of the sensor chip contained a silicon-based Hg-coated Au microelectrodes array (MEA) as the working electrode on one side, and an Ag/AgCl reference electrode and a Pt counter electrode on the other side. Simultaneous detections of trace Zn(II), Cd(II), Pb(II), Cu(II), Fe(III) and Cr(III) were performed. With a computer controlled multipotentiostat, pumps and valves, the electronic tongue realized in-situ and real-time detections of the six heavy metals mentioned above at parts-per-billion levels without manual operation.
展开▼
