Source of Pz Sample no Elovich First-order Second-order Two-constant rate Parabolic diffusion Modified first-order
R2 SE R2 SE R2 SE R2 SE R2 SE R2 SE
MKP 4 0.729 0.49 0.984 0.074 0.909 0.125 0.969 0.131 0.919 0.267 0.987 0.066
  5 0.789 0.4 0.886 0.222 0.75 0.299 0.96 0.147 0.923 0.242 0.958 0.135
  7 0.76 0.547 0.974 0.092 0.901 0.1 0.928 0.176 0.941 0.27 0.989 0.059
  10 0.782 0.195 0.963 0.112 0.871 0.335 0.756 0.196 0.952 0.091 0.998 0.028
PSC 14 0.681 0.526 0.989 0.059 0.933 0.107 0.9 0.09 0.883 0.319 0.967 0.104
  16 0.715 0.661 0.992 0.048 0.937 0.063 0.825 0.242 0.911 0.369 0.978 0.078
  17 0.574 0.543 0.967 0.087 0.956 0.062 0.604 0.326 0.816 0.356 0.857 0.181
  20 0.793 0.928 0.939 0.155 0.817 0.097 0.512 0.302 0.95 0.457 0.994 0.05
BF 22 0.8 0.47 0.921 0.198 0.775 0.277 0.93 0.166 0.951 0.232 0.991 0.068
  24 0.827 0.407 0.927 0.173 0.815 0.209 0.945 0.165 0.974 0.158 0.996 0.041
  26 0.94 0.135 0.806 0.268 0.701 0.413 0.937 0.161 0.984 0.07 0.951 0.134
  29 0.589 0.756 0.985 0.101 0.901 0.248 0.918 0.136 0.81 0.514 0.948 0.192
Table 5: Summary of R2 values and standard error of estimates (SE) of six kinetic models for desorption of P by the DTPA-TEA-CaCl2 solution (pH 7.3) from representative cultivated tailing samples zMKP=monopotasium phosphate (KH2PO4); PSC=peat-shrimp wastes compost; BF=bone flour