Abstract
The adsorption of thiocyanate ions at mercury has been studied from aqueous solutions of two different and constant ionic strengths, namely, xM KSCN + (0.5 − x) M KF and xM KSCN + (1.0 − x) M KF, at 298 K. The surface excess due to thiocyanate ions was determined using the Hurwitz–Parsons analysis as well as using the surface pressure method. The amount of specifically adsorbed thiocyanate ion at a given electrode charge density and thiocyanate concentration is shown to depend on the ionic strength. For both ionic strengths, the adsorption process was found to be described by an isotherm congruent on the electrode charge density, to which virial isotherms were fitted with the following parameter values: B = 210 and 185 Å2 ion−1, and [Formula: see text] and −92.88 kJ mol−1, for ionic strengths 0.5 and 1.0 M, respectively. The properties of the inner layer are discussed based on the corresponding Christie plots.
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