The features of adsorption on amorphous ice are compared for N-2, CO, Ar, Kr, CH4, and CF4, studied by both adsorption isotherm volumetry and infrared spectroscopy. The analysis of the two types of experimental results is consistent, allowing us to distinguish different behaviors according to the strength of the bonding with the ice surface sites. Adsorption energies and capacities have been estimated, and hydrogen bonding with surface dangling O-H has been evidenced for N-2 and CO. Infrared isotherms have been obtained for the three surface sites of ice and are compared with that of the adsorbate in the case of CH4.