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The mechanism of electrode reactions of the β-hydroxyethyl radical has been found experimentally to depend on pH, and a general kinetic scheme of organic radical electroreduction is suggested which includes two parallel pathways of electron transfer, either to adsorbed radical Rads or to its metastable protonated complex [Rads·BH+]; the competition between these pathways is determined by the capacity of Rads for complex formation, the concentration of the proton donor, and electron transfer rates to Rads and [Rads·BH+].