In the title study the order of extractability of the above elements is as follows: Zr>Ti>Th>Fe> Lu. It is possible to separate Zr(IV) from Th(IV), Ti(IV), Fe(III) and Lu(III) with PT-2. By the method of slope analysis, the compositions of extracted complex of Zr(IV) with PT-2 have been determined to be ZrL 2 (HL 2 ) 2 , H 2 Zr(SO 4 ) 3 * 4HL and Zr(HL 2 ) 2 SO 4 . The equilibrium constants and thermodynamic functions of extraction reaction have been calculated.