Skip to main content

Table 5 Rate constants describing Zn desorption release from the soils

From: Effect of contamination sources on the rate of zinc, copper and nickel release from various soil ecosystems

Soil Kombora Abo Rawash Kafr-Elsheikh
a b R2 SE a b R2 SE a b R2 SE
Modified Freundlich equation
 UC* 0.31 0.77 0.93** 0.31 0.21 0.76 0.88** 0.18 0.35 0.79 0.96** 0.17
 C* 0.26 0.39 0.90** 0.26 0.26 0.85 0.88** 0.15 0.24 0.61 0.98** 0.23
Elovich equation
 UC* 3.89 7.02 0.93** 3.89 2.27 5.10 0.94 4.23 3.95 6.37 0.94** 3.16
 C* 2.62 5.86 0.93** 3.62 3.96 6.81 0.94 3.63 2.99 1.57 0.97** 2.46
Parabolic diffusion equation
 UC* 0.32 18.02 0.75* 0.32 0.33 16.06 0.71* 8.91 0.26 14.63 0.70* 6.77
 C* 0.30 16.07 0.74* 0.30 0.27 16.00 0.70* 7.59 0.24 9.62 0.76* 6.11
First-order equation
 UC* − 0.42 − 0.47 0.81** − 0.42 − 0.45 − 0.43 0.82** 0.33 − 0.49 − 0.45 0.87** 0.30
 C* − 0.53 − 0.44 0.83** − 0.43 − 0.52 − 0.50 0.82** 0.38 − 0.52 − 0.35 0.87** 0.30
  1. UC uncultivated soil, C cultivated soil