Microelectrode arrays have been fabricated for the detection and measurement of heavy metal ions in aqueous media. Thin film platinum electrodes have been sputter-deposited on silicon substrate and hemisphere-shaped mercury has been electrodeposited on the platinum microelectrodes. Electrochemical characteristics are tested and compared to those of conventional microelectrodes. Square-wave anodic stripping voltammetry has been applied for quantitative analysis for both test solutions and tab water. Sensitivity in the parts per billion range has been demonstrated for various heavy metal ions including Zn, Cd, Pb and Cu without the addition of supporting electrolytes and agitation.
