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Table 7 Rate constants describing Ni 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* 0.39 0.39 0.95** 0.03 0.22 0.58 0.97** 0.06 0.42 0.67 0.98** 0.03
 C* 0.30 0.29 0.98** 0.12 0.30 0.30 0.98** 0.12 0.32 0.45 0.99** 0.11
Elovich equation
 UC* 2.11 2.53 0.94** 2.22 1.90 3.76 0.94** 2.13 3.30 0.86 0.96** 1.21
 C* 1.99 1.50 0.96** 1.87 1.94 1.64 0.95** 1.96 2.13 0.51 0.97** 0.87
Parabolic diffusion equation
 UC* 0.18 8.34 0.72** 4.69 0.17 9.09 0.70* 4.42 0.11 4.39 0.75* 0.78
 C* 0.17 6.88 0.75** 4.18 0.16 6.94 0.73* 4.22 0.10 3.50 0.75* 2.21
First-order equation
 UC* − 0.34 − 0.33 0.81** 0.27 − 0.43 − 0.47 0.90** 0.34 − 0.26 − 0.30 0.83** 0.28
 C* − 0.45 − 0.38 0.89** 0.24 − 0.45 − 0.36 0.87** 0.28 − 0.28 − 0.35 0.86** 0.24
  1. UC uncultivated soil, C cultivated soil