Table 1.

Comparison of two-parameter and three-parameter isotherms for different organic pollutants. PHEN: phenanthrene; NBZ: nitrobenzene; DCP: 2,4-Dichlorophenol.

Isotherms	PHEN	NBZ	DCP
Freundlich
Kf	29.10 ± 0.93	1.41 ± 0.04	0.88 ± 0.02
n	0.58 ± 0.02	0.88 ± 0.03	0.89 ± 0.03
radj2	0.9871	0.9916	0.9886
Sips
Qm	35.85 ± 1.27	24.81 ± 1.11	23.63 ± 0.87
as	0.063 ± 0.002	0.049 ± 0.001	0.033 ± 0.001
1/n	0.533 ± 0.02	0.556 ± 0.02	0.834 ± 0.03
radj2	0.9574	0.9881	0.9844
Toth
Qm	69.39 ± 3.01	49.33 ± 2.17	46.98 ± 1.72
KT	1.67 ± 0.09	1.19 ± 0.03	3.86 ± 0.07
n	0.248 ± 0.01	0.256 ± 0.01	0.729 ± 0.03
radj2	0.9639	0.9704	0.9500