Table 2 Summary of the sorption curve evaluation. Curve types were classified after Giles and Smith (1974). M₁₀ = sorbed metal concentration in the samples equilibrated with the solution containing 10 mmol/L initial metal concentrations; Q_m Langmuir maximum saturated monolayer capacity; b Langmuir constant related to the affinity between adsorbent and adsorbate; R_L Langmuir separation factor; K_F Freundlich constant related to sorption capacity; n Freundlich exponent. Relating equations are given in the supplementary material

From: Effect of pedogenic iron-oxyhydroxide removal on the metal sorption by soil clay minerals

			Langmuir				Freundlich
Sample	Curve type	M₁₀	Q_m	b	R²	R_L range	K_F	n	R²
Sample	Curve type	(mmol/kg)	(mmol/kg)	(L/mmol)			(mmol/kg)
Cadmium
LB	L1	12.69	16.98	0.29	0.99	0.97-0.27	3.84	0.55	0.99
LB_DCB	L2	4.23	4.33	2.37	0.98	0.82-0.04	2.53	0.27	0.92
PC	H2	21.54	22.23	142.16	0.99	0.07-0.001	20.29	0.16	0.78
PC_DCB	H1	11.40	9.26	84.56	0.71	0.11-0.001	7.77	0.14	0.89
Copper
LB	L1	13.77	15.25	0.84	0.99	0.93-0.11	6.26	0.39	0.98
LB_DCB	L1	12.75	12.54	5.21	0.99	0.66-0.02	8.50	0.24	0.87
PC	H1	88.31	85.59	9.23	0.93	0.53-0.01	61.87	0.21	0.99
PC_DCB	H1	53.18	48.47	8.85	0.91	0.55-0.01	33.96	0.21	0.98
Lead
LB	L2	32.03	33.57	2.33	0.99	0.82-0.04	19.04	0.31	0.94
LB_DCB	L1	41.81	41.92	2.36	0.98	0.82-0.04	23.36	0.29	0.97
PC	HC	273.79	523.04	3.26	0.97	0.76-0.03	486.85	0.56	0.99
PC_DCB	HC	313.35	1351.17	0.27	0.99	0.97-0.24	286.97	0.83	1.00
Zinc
LB	L1	7.87	8.42	0.92	0.99	0.92-0.10	3.47	0.40	0.94
LB_DCB	L1	6.01	6.71	0.79	0.87	0.93-0.12	2.98	0.30	0.97
PC	H2	13.42	13.60	7.47	0.81	0.04-0.0004	10.09	0.14	0.96
PC_DCB	H2	7.75	8.07	2.63	0.75	0.06-0.0006	5.46	0.12	0.95

Back to article page