Abstract
Adsorption of sodium phenylanthranilate (SPA) and dioctyl phosphate (DOP) on the iron surface from a neutral borate buffer in a Erange from 0.0 to 0.8 V was studied by ellipsometry and diffuse reflection IR spectroscopy. The adsorption of SPA is enhanced with potential only for the low concentrations of the adsorbate. The oxidation of aromatic amino acid at high anodic potentials reduces its adsorption. In the same potential range, the adsorption of sodium DOP is enhanced with an increase in E. The data obtained were used to plot an adsorption isotherm and determine adsorption constants. The IR studies of the oxidized iron exposed to borate solutions containing organic anions confirmed that DOP adsorbs on the iron surface more strongly than SPA is. The IR spectrum of DOP changes during its adsorption, suggesting the formation of a saltlike surface complex.
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