The present paper presents the results of the extraction of Zn(II), Cu(II) and Cd(II) from 0.1 M NaNO3 at 25 degrees C by impregnated resins containing a bifunctional extractant, incorporating phosphine oxide and phosphoric acid diester funcionalities, O-methyl-dihexyol-phosphine-oxide O＇-hexyl-2-ethyl phosphoric acid (HL). Solvent impregnated resins have been prepared by direct adsorption of I-IL into the styrene/divinylbenzene macroporous support, Amberlite XAD2, by using the dry impregnation method. The adsorption of HL, on the styrene/divinylbenzene macroporous support is shown by FTIR spectroscopy to be the result of only weak extractant-support interactions. The distribution coefficient of Zn(II), Cu(II) and Cd(II) was determined as a function of pH and extractant (HL) concentration in the resin phase and the data were analyzed graphically using the slope analysis method and numerically using the program LETAGROP-DISTR. The composition of the extracted species in the resin phase has been determined. Analysis of the results showed that the extraction of these metal ions can be explained assuming the formation of metal complexes in the resin phase with a general composition ML(p)(NO3)(t)(HL)(q) where p, t, q take different values depending on the metal. An extraction reaction is proposed and the extraction constants of these species are given.