A microlithographically fabricated iridium ultramicroelectrode array is used to provide a disk array for formation of mercury microhemispberes. The mercury ultramicroelectrode array (Hg UMEA) shows a response with chronoamperometry and square wave anodic stripping voltammetry equivalent to that expected for a single Hg UME. The array, made up of 19 interconnected 10-pm-diameter UMEs, provides a multiplication of the signal current proportional to the number of UMEs in the array,
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