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The parameters of extraction from aqueous solutions into the organic phase of iron, aluminum, manganese and titanium are determined from the pH and concentration of the extractant when they are extracted with oleic and naphthenic acids, as well as olive and sunflower oils. The values of the thermodynamic functions of extraction equilibria with the participation of carboxylic acids and natural oils are taken as the basis for constructing the extractability series, which makes it possible to determine the thermodyna...