Nitrate Sorption in an Agricultural Soil Profile

Table 2

Langmuir and Freundlich parameters for sorption of NO₃⁻ on four depths of iso-humic soil from Chott Mariam, Tunisia.

		Depths
		0–25 cm	25–60 cm	60–90 cm	90–120 cm
Langmuir parameters	𝑄 (mg/g)	0.153	0.134	0.144	0.121
	𝐾𝐿 (L/mg)	0.0031	0.0041	0.0046	0.0068
	𝑅^2	0.89	0.95	0.93	0.97
Freundlich parameters	𝐾𝐹	0.00086	0.001	0.0012	0.002
	𝑛	1.23	1.27	1.28	1.44
	𝑅^2	0.99	0.99	0.98	0.99