The attractive stripping voltammetric performance of the recently developed RAM electrode, consisting of 3.5‐μm radius carbon microdisks embedded in epoxy resin, is described. The microdisk dimensions and interdisk spacings of the RAM surface lead to nonlinear diffusional flux and offer efficient metal deposition from quiescent samples. Coupled with large “collective” stripping currents, a wide potential window and a low background current, the new electrode yields low detection limit (e.g., 0.3 μg/L lead and cadmium for 2‐min deposition) and good precision (2.1–2.3% RSD, n = 15). Assays of drinking water are used for illustration.
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Wang et al. (1995) studied this question.
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