In this work, the adsorption of Au(III) and Zn(II) by impregnated resins has been studied in batch and column experiments. In batch experiments successive contacts for each metal concentration were made until saturation was reached. Equilibrium points corresponding to each contact brought a different isotherm. By introducing a new variable it was observed that all the equilibrium points fitted a surface that we call the equilibrium surface. Once the equilibrium surface was determined it was found that the different isotherms, obtained in batch and column experiments, were fitted on the surface. Traditional isotherms and the equations of the equilibrium surfaces for zinc(II) and gold(III) adsorption with impregnated resins have been compared and discussed. The equilibrium surface equation proposed in this work has been proven to be a good tool for modelling adsorption by impregnated resins in batch and column experiments.