Abstract
Adsorption of sodium oleate and its formulation with sodium phenylanthranilate from a borate buffer (pH 7.36) at passive iron was studied by ellipsometry and IR spectroscopy. The adsorption isotherm of sodium oleate was classified and its adsorption constants were determined. It was shown that the isotherm of a mixture of sodium oleate with sodium phenylanthranilate is shifted to lower concentrations, which is characteristic of a higher adsorption energy. The concurrent adsorption of these compounds is not induced since neither component enhances the adsorption of the other. IR spectroscopic data showed that, adsorbing at the oxidized iron surface, sodium oleate causes the formation of new compounds.
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