With qe as the equilibrium uptake of the adsorbate, Ce as the residual concentration of the adsorbate in solution after equilibration, KF and n as the Freundlich parameters. According to Ghosal et al. the Freundlich parameters can be translated to the dimensionless equilibrium constant Keq dependent on the unit of KF. As de Ridder reported the values for KF in (μg/g)(L/μg) n the conversion works as follows: