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Table 6 Rate constants describing Cu 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* 0.20 0.79 0.91** 0.12 0.24 0.52 0.93** 0.24 0.25 0.77 0.98** 0.16
 C* 0.18 0.71 0.92** 0.11 0.23 0.67 0.96** 0.18 0.23 0.67 0.95** 0.18
Elovich equation
 UC* 2.37 4.58 0.98** 0.98 3.43 3.61 0.97** 1.87 4.27 5.58 0.96** 2.71
 C* 2.14 5.55 0.97** 1.71 2.16 4.69 0.97** 1.81 2.34 4.85 0.96** 2.16
Parabolic diffusion equation
 UC* 0.29 10.35 0.78* 4.19 0.37 11.89 0.62 ns 5.72 0.27 14.24 0.74* 6.68
 C* 0.21 11.83 0.77* 4.65 0.39 13.46 0.62 ns 6.01 0.20 11.28 0.73* 5.05
First-order equation
 UC* − 0.36 − 0.37 0.87** 0.22 − 0.42 − 0.36 0.85** 0.24 − 0.29 − 0.40 0.85** 0.28
 C* − 0.38 − 0.41 0.85** 0.25 − 0.37 − 0.39 0.86** 0.25 − 0.31 − 0.41 0.83** 0.26
  1. UC uncultivated soil, C cultivated soil