| Elements | As | Cd | Co | Cr | Fe | Pb | Sb | Tl |
| Arsenic | 1 | 0.948** | 0.976** | 0.960** | 0.623** | 0.621** | 0.800** | 0.953** |
| Cadmium | 0.948** | 1 | 0.984** | 0.992** | 0.427** | 0.593** | 0.706** | 0.961** |
| Cobalt | 0.976** | 0.984** | 1 | 0.991** | 0.554** | 0.628** | 0.773** | 0.967** |
| Chromium | 0.960** | 0.992** | 0.991** | 1 | 0.507** | 0.602** | 0.743** | 0.970** |
| Iron | 0.623** | 0.427** | 0.554** | 0.507** | 1 | 0.346** | 0.714** | 0.547** |
| Lead | 0.621** | 0.593** | 0.628** | 0.602** | 0.346** | 1 | 0.433** | 0.615** |
| Antimony | 0.800** | 0.706** | 0.773** | 0.743** | 0.714** | 0.433** | 1 | 0.746** |
| Thallium | 0.953** | 0.961** | 0.967** | 0.970** | 0.547** | 0.615** | 0.746** | 1 |