Abstract
An electrochemical sensor was fabricated by screen printing techniques. This sensor, coupled with stripping voltammetry, could provide a means for a relatively inexpensive on site detector for trace levels of heavy metals. The sensor consists of an electrode pair of graphite/carbon black working electrode and Ag/AgCl reference electrode printed onto a polycarbonate surface. Microscope observation of the working electrode shows considerable surface roughness. Cyclic voltammograms of ferricyanide and lead nitrate indicated that the electrochemical nature of the carbon working electrode and the reference electrode on the sensor were comparable to the performance of conventional glassy carbon and Ag/AgCl reference electrodes. Lead in the 10−6–10−9 M concentration range using linear scan anodic stripping voltammetry with identical deposition times resulted in a linear relationship between peak current and analyte concentration. Square-wave anodic stripping voltammetry is compared with alternative electroanalytical techniques and is shown to offer the advantage of rapid determination of lead in O2-containing solutions.
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