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| Type | Cr | Ni | Cu | Pb | |
| Cr | A | 1 | 0.278 | 0.863a | 0.595a |
| B | 1 | 0.341a | −0.184b | 0.365a | |
| C | 1 | 0.904a | 0.711a | 0.188 | |
| Ni | A | 1 | 0.331 | 0.251 | |
| B | 1 | 0.453a | 0.371a | ||
| C | 1 | 0.799a | 0.466a | ||
| Cu | A | 1 | 0.598a | ||
| B | 1 | 0.194b | |||
| C | 1 | 0.476a | |||
| Pb | A | 1 | |||
| B | 1 | ||||
| C | 1 |
Correlation is significant at the 0.01 level (2-tailed).
Correlation is significant at the 0.05 level (2-tailed).
