I want to calculate qe (adsorbent phase concentration after equilibrium) for naphthalene when a petroleum refinery wastewater flows through a fixed bed activated carbon adsorber. Since we are dealing with a multi-component adsorption case and petroleum refinery wastewater contains many compounds my question is what compounds must I select besides naphthalene in the petroleum refinery effluent in order to include them in the calculations using a multi-component isotherm equation? Can anyone help me with this?