| Abstract: | Cationic surface excesses at the mercury/aqueous A1Cl3, LaCl3 and AlCl3 + LaCl3 interphases have been determined from differential capacity, potential of zero charge and interfacial tension measurements. A comparative analysis of the adsorption of La3+ and Al3+ at negative potentials has been carried out. No definite support for La3+ specific adsorption has been found. On the other hand, a simple combination of ion size effects and the Gouy-Chapman theory was able to give a reasonable account of the experimental surface excesses, obtained from either single-salt or mixed-salt solutions. |
