New data from impedance measurements concerning the anodic dissolution of iron in acidic sulphuric media

A flow cell assembly is described featuring ultra-low electrolyte flow propulsion rates (10^?5 to 10^?3 cm³ s^?1) in combination with a working electrode compartment of thin layer dimensions (thickness < 10^?2 cm), enabling thus the exhaustive electrolysis of electroactive species at a potential-controlled detector electrode. The cell can be used to detect trace amounts (>10^?12 mol) of electroactive species delivered into or withdrawn from the streaming electrolyte, such as compounds adsorbed at or desorbed from an ideally polarizable electrode, allowing the independent determination of Δq- and Λ-isotherms of cation adsorbates. The flow cell has been used to study the adsorption of Tl on polycrystalline Ag in KCl solution. The isotherms obtained can be interpreted in terms of competitive Cl^? adsorption within the Tl⁺ adsorption range.