International Journal of Agronomy

Research Article

Exchange Characteristics of Lead, Zinc, and Cadmium in Selected Tropical Soils

Table 4

Thermodynamic data for adsorption on samples AD2, AD3, and NB.


	30°C	60°C	(kJ mol⁻¹) at 30°C	(kJ mol⁻¹) at 60°C	(kJ mol⁻¹)	(JK⁻¹ mol⁻¹)

AD2 Pb²⁺	0.85	0.90	0.4176	0.2780	1.8288	4.66
AD2 Cd²⁺	3.47	3.39	−3.1328	−3.3793	−0.6431	8.22
AD2 Zn²⁺	2.72	2.84	−2.5181	−2.8893	1.2303	12.37
AD3 Pb²⁺	3.10	2.05	−2.8524	−1.9828	−11.6352	−28.99
AD3 Cd²⁺	2.77	2.21	−2.5678	−2.1924	−6.3587	−12.51
AD3 Zn²⁺	3.38	4.33	−3.0678	−4.0590	6.9431	33.04
NB Pb²⁺	0.46	0.46	1.9649	2.15730	0.0224	−6.41
NB Cd²⁺	3.78	3.54	−3.3474	−3.4979	−1.8288	5.01
NB Zn²⁺	2.52	2.97	−2.3259	−3.0133	4.6166	22.91