Abstract
The electroehemical properties of the silver sulfide-solution interface in sodium nitrate and acetate solutions in the presence of dodecylammonium acetate were investigated. The adsorption of amine on silver sulfide surfaces at pH 4.7 was found to be strongly dependent on pAg. A shift in the zero-point-of-charge (zpc) towards a lower pAg and an increased adsorption of potential-determining ions on negative polarization of the surface due to the adsorption of amine indicate a specific affinity of dodecylammonium ion for silver sulfide surfaces. Integration of the adsorption isotherms of the potential-determining ions shows a marked depression of the surface tension due to the adsorption of the organic cation on negative polarization of the surface, similar to the electrocapillary curves reported on Hg in the presence of alkylammonium compounds.
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