INFLUENCE OF SOLUTION PH ON THE ADSORPTION OF SODIUM PHENYLANTHRANILATE ON IRON

The following methods were used to investigate the adsorption of pheny lanthranilate anions on the surface of oxidized and nonoxidized iron f rom borate buffer solutions: coulometry, ellipsometry, impedance spect roscopy, and IR spectroscopy. It was shown that the thickness of the p assive film formed on the surface of iron during its oxidation decreas es with increasing pH of the solution. The reaction of sodium phenylan thranilate with an iron electrode is characterized by the formation of a complex of the amino acid with the metal. At pH > pH(IEP), the adso rption of anions on an oxidized surface is hindered.