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The contamination factors (CFs) and contamination classification.
| Elements | Zn | Cu | Ni | V | Co | Fe | Mn | Al | Pb | Cr |
|---|---|---|---|---|---|---|---|---|---|---|
| CF (2022, n = 67) | 7.45 2 | 6.50 2 | 6.87 2 | 4.42 2 | 3.20 1 | 5.14 2 | 4.88 2 | 5.50 2 | 11.23 3 | 6.35 2 |
| CF (2017, n = 68) | 4.97 2 | 3.50 1 | 5.10 2 | 4.36 2 | — | 4.95 2 | 4.68 2 | — | 7.98 2 | 5.68 2 |
Note: 1 Slight contamination; 2 moderate contamination; 3 severe contamination.
