Surface areas and pore structure studies were carried out for metal doped carbons (Ni, Cu, Cd and Zn) containing different fraction of metals. It is observed that mercury intrusion and extrusion curves are irreversible giving the evidence of ''ink bottle'' pores in the carbon samples. Results indicate that the surface areas obtained by mercury porosimetry are very small comparative to the surface areas determined by nitrogen adsorption. Low values of surface areas by mercury porosimetry indicate the presence of a microporous system which is only accessible to nitrogen molecules but not to mercury.