Table 4.
Eigenvectors (EV) of correlation matrix for all samples (n = 190) obtained by PCA for first seven factors (PC1–PC7 with eigenvalues of correlation matrix > 1), total variability % for calibration set (TV), total variability % obtained by cross validation (CV), and significance of the variables (highlighted are the p < 0.05).
| PC1 | PC2 | PC3 | PC4 | PC5 | PC6 | PC7 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| TV (%) | 15,64 | 13,52 | 10,87 | 7,43 | 6,41 | 5,82 | 5,15 | |||||||
| CV (%) | 7,90 | 10,19 | 7,61 | 3,59 | 1,62 | 3,09 | 4,63 | |||||||
| Measurand | EV | p | EV | p | EV | p | EV | p | EV | p | EV | p | EV | p |
| 18O/16O | 0.08 | 0.03 | 0.04 | 0.06 | −0.48 | 0.00 | −0.15 | 0.00 | 0.20 | 0.00 | 0.09 | 0.23 | −0.18 | 0.06 |
| 13C/12C | 0.08 | 0.04 | 0.08 | 0.01 | −0.46 | 0.00 | 0.04 | 0.44 | 0.27 | 0.00 | 0.06 | 0.46 | −0.12 | 0.22 |
| Al | 0.28 | 0.00 | −0.09 | 0.01 | −0.09 | 0.02 | −0.40 | 0.00 | −0.14 | 0.11 | 0.07 | 0.44 | 0.26 | 0.08 |
| As | 0.08 | 0.09 | −0.01 | 0.71 | −0.08 | 0.02 | −0.18 | 0.02 | −0.26 | 0.00 | −0.26 | 0.02 | 0.58 | 0.00 |
| B | 0.04 | 0.03 | 0.23 | 0.00 | −0.29 | 0.00 | 0.10 | 0.00 | −0.31 | 0.00 | −0.31 | 0.00 | −0.12 | 0.05 |
| Ba | 0.23 | 0.00 | 0.02 | 0.54 | 0.26 | 0.00 | −0.15 | 0.06 | 0.28 | 0.00 | −0.33 | 0.00 | −0.17 | 0.04 |
| Ca | 0.11 | 0.01 | 0.24 | 0.00 | 0.27 | 0.00 | 0.24 | 0.00 | −0.28 | 0.00 | 0.02 | 0.82 | 0.07 | 0.38 |
| Cd | 0.11 | 0.00 | −0.24 | 0.00 | −0.15 | 0.00 | 0.48 | 0.00 | 0.09 | 0.06 | −0.04 | 0.42 | 0.18 | 0.01 |
| Co | 0.36 | 0.00 | −0.29 | 0.00 | −0.02 | 0.62 | 0.08 | 0.12 | −0.05 | 0.21 | −0.07 | 0.32 | −0.12 | 0.26 |
| Cr | 0.22 | 0.00 | −0.17 | 0.00 | −0.10 | 0.29 | 0.02 | 0.82 | −0.21 | 0.01 | 0.05 | 0.68 | −0.35 | 0.06 |
| Cu | 0.01 | 0.92 | 0.00 | 0.98 | 0.03 | 0.65 | 0.07 | 0.64 | −0.25 | 0.31 | 0.19 | 0.25 | −0.36 | 0.40 |
| Fe | 0.13 | 0.05 | −0.25 | 0.00 | −0.07 | 0.30 | −0.17 | 0.17 | 0.21 | 0.12 | −0.03 | 0.86 | 0.18 | 0.49 |
| K | 0.11 | 0.01 | 0.16 | 0.00 | −0.23 | 0.00 | 0.12 | 0.09 | −0.07 | 0.21 | −0.49 | 0.00 | 0.02 | 0.80 |
| Li | 0.22 | 0.00 | −0.11 | 0.00 | 0.28 | 0.00 | −0.20 | 0.03 | 0.08 | 0.42 | −0.07 | 0.67 | −0.15 | 0.23 |
| Mg | 0.28 | 0.00 | 0.34 | 0.00 | 0.03 | 0.13 | 0.19 | 0.00 | 0.24 | 0.00 | 0.09 | 0.04 | 0.11 | 0.16 |
| Mn | 0.28 | 0.00 | 0.01 | 0.49 | 0.25 | 0.00 | −0.09 | 0.15 | 0.23 | 0.02 | −0.23 | 0.08 | −0.19 | 0.07 |
| Mo | 0.24 | 0.00 | −0.21 | 0.00 | 0.06 | 0.15 | 0.33 | 0.00 | −0.26 | 0.00 | 0.06 | 0.23 | −0.07 | 0.45 |
| Na | 0.29 | 0.03 | −0.02 | 0.59 | −0.11 | 0.04 | −0.27 | 0.12 | −0.20 | 0.30 | 0.28 | 0.22 | −0.02 | 0.88 |
| Pb | 0.24 | 0.00 | −0.34 | 0.00 | −0.18 | 0.00 | 0.17 | 0.00 | 0.08 | 0.11 | 0.03 | 0.64 | 0.14 | 0.17 |
| Rb | 0.03 | 0.53 | 0.18 | 0.00 | −0.14 | 0.01 | −0.19 | 0.04 | −0.19 | 0.10 | −0.36 | 0.01 | −0.22 | 0.14 |
| Sn | 0.11 | 0.01 | 0.36 | 0.00 | −0.10 | 0.02 | −0.08 | 0.14 | 0.10 | 0.19 | 0.30 | 0.00 | 0.06 | 0.52 |
| Sr | 0.30 | 0.00 | 0.19 | 0.00 | 0.09 | 0.18 | −0.01 | 0.92 | −0.15 | 0.14 | 0.10 | 0.27 | 0.12 | 0.23 |
| V | 0.30 | 0.00 | 0.34 | 0.00 | 0.04 | 0.04 | 0.23 | 0.00 | 0.20 | 0.00 | 0.06 | 0.16 | 0.09 | 0.19 |
| Zn | 0.16 | 0.08 | 0.11 | 0.05 | 0.01 | 0.86 | −0.11 | 0.47 | −0.22 | 0.36 | 0.22 | 0.32 | −0.03 | 0.92 |