. 2013 Nov 4;10(11):5830–5843. doi: 10.3390/ijerph10115830

Table 3.

Isotherm adsorption parameters for Pb, Cu and Cd in monometal and bi-solutes systems on the soil (q_maxL; q_maxJS: mg·g⁻¹; b_L, b_JS, K_F: L·mg⁻¹).

Metals	Adsorption batch tests	Langmuir parameters			Freundlich parameters
Metals	Monometal	q_maxL	b_L	R_L²	1/n	K_F	R_F²
Pb	Cd²⁺	3.64	0.37	0.91	1.41	0.85	0.91
Cu	Cu²⁺	0.70	1.81	0.91	0.78	0.45	0.92
Cd	Cd²⁺	0.63	0.05	0.90	1.01	0.03	0.89
	Bi-metal	Jain and Snoeyink parameters
	Bi-metal	q_maxJS	b_JS	R_JS²	Δq_JS (%)	r_JS
Pb	(Pb²⁺–Cd²⁺)	3.09	0.36	0.99	15.11	0.85
Pb	(Pb²⁺–Cu²⁺)	2.95	1.40	0.97	18.95	0.81
Cu	(Cu²⁺–Cd²⁺)	0.59	2.07	0.98	15.71	0.84
Cu	(Cu²⁺–Pb²⁺)	0.45	1.63	0.94	35.71	0.64
Cd	(Cd²⁺–Pb²⁺)	0.46	0.09	0.87	26.98	0.73
Cd	(Cd²⁺–Cu²⁺)	0.10	0.44	0.75	84.13	0.16
	Tri-metal	Extended Langmuir parameters
	Tri-metal	q_maxLE	b_LE	R_LE²	Δq_LE (%)	r_LE
Pb	(Pb²⁺–Cu²⁺–Cd²⁺)	0.77	1.56	0.95	78.86	0.21
Cu	(Cu²⁺–Pb²⁺–Cd²⁺)	0.43	1.79	0.98	38.57	0.61
Cd	(Cd²⁺–Pb²⁺–Cu²⁺)	0.10	0.85	0.91	84.13	0.16