Abstract
The adsorption of SCN– ions and thiourea has been investigated by measuring the capacity of a mercury electrode. Adsorption isotherms for SCN– indicate a large ion-ion interaction which appears to decrease as the bulk solution concentration increases. In contrast, thiourea adsorption can be expressed by a Frumkin isotherm with constant interaction parameter equivalent to a second virial coefficient of 84 A2 molecule–1. The apparent dielectric constant passes through a maximum at a charge on the electrode of about + 6µC cm–2. Thiourea displaces adsorbed nitrate ions from the mercury electrode. Inaccuracies in the drop-time method for determining interfacial tension are discussed and a new method for obtaining an approximate value of the absolute mercury-water interfacial tension is described.
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