[en] Solvent extraction of pertechnetate anions from aqueous solutions of some mineral acids (HCl, HNO₃, HClO₄, H₂SO₄), salts (NaCl), NaNO₃, NaClO₄, K₂CrO₄, Na₂CO₃) and NaOH, NH₄OH by tetraphenylphosphonium chloride in chloroform and nitrobenzene was studied. The results are presented in the form of the dependencies of extraction characteristics of graphical plots of TcO₄^- (distribution ratio, percentage of extraction) on the (C₆H₅)₄PCl, H⁺ and competitive anion concentrations. The solvent extraction of sub- and super-stoichiometric radio of TcO₄^-:(C₆H₅)₄P⁺ was performed. The extraction constant values of ion pairs TcO₄^--Cl^-, TcO₄^--NO₃^-, TcO₄^--ClO₄^- and individual anions TcO₄^-, Cl^-, NO₃^-, ClO₄^- were calculated. (authors)