From: Determination of some heavy metals from aqueous solutions using modified Amberlite XAD-4 resin by selective solid-phase extraction
Metal ion
Langmuir isotherm method
Freundlich isotherm method
b
Q0
R2
RL
Kf
n
Pb (II)
0.0052
0.2647
0.9962
0.9058
0.0282
0.3093
0.9895
Cd (II)
0.0080
0.6553
0.9980
0.8620
0.0315
0.1918
0.9774