Table 2 Sorption isotherms describing the adsorption behavior of K onto the soil samples.

From: Soil potassium adsorption and speciation dynamics with associated clay microstructural changes revealed by synchrotron X-ray microscopy

Soil sample

Langmuir Isotherm

Freundlich Isotherm

qmax mg g− 1

KL L mg− 1

r2

KF mg g− 1

n

r2

W

0.24

0.05

0.99

0.09

5.88

0.89

L

0.31

0.14

0.99

0.15

7.69

0.78

A

0.51

0.09

0.99

0.23

7.14

0.84

R

0.20

0.02

0.99

0.03

2.94

0.77

F

0.67

0.16

0.99

0.29

6.67

0.70

  1. W = non-fertilized soil; L = long-term K-fertilized soil; A = alkaline soil; R = red soil, and F = forest soil.
Back to article page