Hannover 2003 – wissenschaftliches Programm

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UP: Umweltphysik

UP 7: Hydrosphäre, Bodenphysik, Umwelt und Gesellschaft

UP 7.4: Vortrag

Freitag, 28. März 2003, 12:30–12:45, F 442

Electric potential and reaction rates at charged surfaces in asymmetric electrolytes - comparison between experiment and a novel theory — •H. Lustfeld¹ and A. Pohlmeier² — ¹Forschungszentrum Jülich, IFF, 52425 Jülich — ²Forschungszentrum Jülich, ICG IV, 52425 Jülich

The electric potential and reaction rates of ions hitting the chemically active surface of microcrystals in an asymmetric electrolyte are computed analytically using a novel theory*). Comparison with this theory is made experimentally by measuring the reaction rates of Pb²⁺ and Cd²⁺ at the surface of goethite microcrystals suspended in aqueous solution of NaNO₃. The measurements were taken over a wide range of temperature and pH values. The agreement between theory and experiment is very satisfactory in all cases. *)H. Lustfeld, A. Pohlmeier, J.Colloid Interface Sci 181, 45 (2001)