Anodic Characterization of Mercury Microelectrodes in Electrolytes at the Micromolar Level

摘要

Mercury microelectrodes based on platinum wires of a radius of either 1 or 12.5 microm were examined anodically in several very dilute electrolytes: NaBr, NaC1, Na2C2O4, NaOH, ethylenediaminetetraacetic acid, NaSCN, NaNO3, and thiourea. Anodic response was obtained in micromolar solutions of the electrolytes and the measured current was in most cases directly proportional to the concentration. Waves obtained wth such electrodes provide fast, reliable diagnosis in cases of adsorption or precipitation at the electrode surface. Equations describing anodic waves of mercury microelectrodes are proposed. (mjm)