Table 4.

Models and parameters related to adsorption isotherm of cadmium.

Model	Langmuir model			Freundlich model
Parameter	Qm	kL	R2	1/n	Kf	R2
Clean soil	454.55	0.367	0.998	0.133	11.33	0.986
PHE-contaminated soil	526.32	0.404	0.999	0.149	11.85	0.944