Effect of different ratios of copper and arsenic in aqueous solutions of different concentrations together with immersion time on absorption of these elements by and their movement into the wood of Eucalyptus globules Labill has been described. Arsenic was preferentially absorbed in almost all the treatments while the relative absorption of either of the elements was not affected in any specific way by the concentration level and the immersion time. Arsinic did not affect the movement of copper and or was possible to achieve the desired depth of penetration of the latter.