Abstract
In this paper a quantitative study ofthe adsorption of iso-C 4 H 9 CN (isovaleronitrile, IVN) at the interfaces between Hg and In-Ga alloy (eutectic composition) electrodes and aqueous solutions is described. The equilibrium charge densities at Hg electrodes were determined from both electrocapillary and impedance measurements, whereas at the In-Ga electrode only impedance data were available. The adsorption parameters for IVN, including the standard Gibbs energy of adsorption (ΔG a d s °), the lateral interaction parameter a, and the limiting Gibbs surface excess (Γ m a x ), were calculated and compared with previous data relative to the behavior of aliphatic compounds at different interfaces. The experimental results are discussed in terms of metal-solvent and metal-adsorbate interactions.
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