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Table 8 Loadings of the 4 PC’s considering as variables the leached metals and ions concentration

From: Characterization and assessment of potential environmental risk of tailings stored in seven impoundments in the Aries river basin, Western Romania

Parameter PC1 PC2 PC3 PC4
Al 0.864** −0.017 0.330 0.019
Fe 0.070 −0.143 0.909** 0.065
Ca 0.278 −0.047 0.875** 0.092
K −0.105 0.873** −0.193 0.211
Mg 0.903** −0.109 0.061 0.087
Na −0.097 0.914** −0.053 0.078
Mn 0.905** −0.059 0.181 −0.001
Ba 0.083 0.682* −0.031 0.513*
Zn 0.874** −0.095 0.287 −0.015
Pb 0.589* −0.178 0.685* 0.077
Cu 0.792** −0.109 0.465 0.032
Ni 0.882** −0.083 0.267 −0.005
Cr 0.566* −0.280 0.612* −0.011
As 0.370 −0.362 0.400 0.413
Cd 0.901** −0.085 0.188 −0.027
Co 0.900** −0.064 0.202 −0.004
Sr 0.322 0.277 0.802** 0.153
Ti 0.584* −0.130 0.696* 0.104
pH −0.319 0.543* −0.411 0.516*
EC 0.543* −0.048 0.745* 0.045
DOC 0.073 0.069 0.398 0.791**
F- 0.653* −0.027 0.649* 0.082
Cl- −0.008 0.734* 0.459 −0.170
NO3- −0.189 0.852** −0.120 −0.227
SO42- 0.579* −0.088 0.715* 0.055
NH4+ 0.207 −0.152 0.664* −0.290
Variability (%) 61 18 11 6
  1. **strong influence on the latent factor (>0.75); *moderate influence on the latent factor (0.50–0.75).