Economic and Environmental Geology

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Table. 3.

Table. 3.

The results of multiple regression analyses for each heavy metal

Metals Soil condition Variable input Multiple regression analysis R2 p value
Cd low pH enter DTPA = 0.053 pH – 0.001 CEC – 0.130 logOM + 0.858 logAR – 0.003 0.561 0.001
stepwise DTPA = 0.882 logAR + 0.205 0.491 < 0.001
Cu low pH enter logDTPA = 0.183 pH + 0.003 CEC – 0.023 logOM + 0.739 logAR – 1.812 0.413 0.003
Ni low pH enter logHNO3 = 0.262 pH + 0.005 CEC – 0.190 logOM + 0.886 logAR – 2.711 0.404 0.001
Zn all pH enter logHOAc = -0.015 pH – 0.001 CEC + 0.003 logOM + 0.003 AR + 0.935 0.648 < 0.001
stepwise logHOAc = 0.003 AR + 0.835 0.643 < 0.001
enter logHNO3 = -0.022 pH + 0.012 CEC + 0.317 logOM + 0.005 AR + 0.224 0.554 < 0.001
stepwise logHNO3 = 0.005 AR + 0.012 CEC + 0.314 logOM + 0.101 0.55 < 0.001
enter logDTPA = -0.015 pH + 0.010 CEC + 0.168 logOM + 0.003 AR + 0.419 0.478 < 0.001
stepwise logDTPA = 0.003 AR + 0.010 CEC + 0.398 0.459 < 0.001
high pH stepwise CaCl2 = 0.058 CEC – 0.962 logOM + 2.025 0.487 < 0.001
stepwise logHOAc = 0.003 AR + 0.868 0.652 0.001
enter logHNO3 = 0.045 pH + 0.018 CEC + 0.206 logOM + 0.005 AR – 0.357 0.631 < 0.001
stepwise logHNO3 = 0.005 AR + 0.019 CEC + 0.048 0.593 < 0.001 0.593 < 0.001
enter logDTPA = 0.046 pH + 0.016 CEC –0.144 logOM + 0.004 AR – 0.076 0.525 0.003
stepwise logDTPA = 0.004 AR + 0.015 CEC + 0.237 0.508 < 0.001
low pH enter logHOAc = 0.046 pH – 0.014 CEC + 0.034 logOM + 0.005 AR + 0.669 0.748 0.003
stepwise logHOAc = 0.004 AR – 0.014 CEC + 0.955 0.737 < 0.001
enter logHNO3 = 0.124 pH + 0.007 CEC + 0.367 logOM + 0.006 AR – 0.623 0.591 < 0.001
stepwise logHNO3 = 0.006 AR + 0.369 logOM + 0.224 0.55 0.005
enter logDTPA = -0.025 pH – 0.001 CEC + 0.216 logOM + 0.004 AR + 0.550 0.584 0.005
stepwise logDTPA = 0.004 AR + 0.478 0.543 < 0.001 0.543 < 0.001
Econ. Environ. Geol. 2021;54:259-69 https://doi.org/10.9719/EEG.2021.54.2.259
© 2021 Econ. Environ. Geol.