Iodine ion adsorption and the electric double layer structure at a mercury electrode in aqueous potassium iodide solutions containing 0,05 M thiourea

Electrocapillary measurements were used to obtain isotherms of specific adsorption of I- anions on the Hg/H2O boundary from KI+0.05 M of thiourea (TU) solutions. Is is shown that these data can be described by a simple varial isotherm, but disagree with Grahame-Parsons model. It follows from the suggested model interpretation of obtained results that electric centers of specifically adsorbed anions are displaced during coadsorption of TU molecules to the side of Helmholtz external plane, leading to disappearance of Esin-Markov effect