Abstract
The adsorption of indium(III) at a mercury electrode from acidified thiocyanate medium has been quantitatively characterized using the chronocoulometric technique. The indium(III) surface excess increases at more positive electrode potentials and passes through a maximum at 0.1–0.2 M thiocyanate concentration. Indium(III) gave no detectable adsorption from iodide or bromide media, nor did nickel(II) adsorb from thiocyanate medium. There appears to be no obvious correlation between the catalysis of indium(III) reduction by thiocyanate iodide, and bromide ions and the tendencies of these anions to cause indium(III) adsorption. Some discussion of the problems of interpretation of the electrode potential and ligand concentration effect on metal complex adsorption is given.
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