Heavy metal | Site A | Site B |
Cr | 3.7 | 2.5 |
Mn | 1.3 | 1.1 |
Cd | ND | ND |
Ni | 0.6 | 0.4 |
Cu | 1.4 | 0.8 |
Zn | 1.0 | 0.7 |
As | 9.2 | 6.8 |
Pb | ND | 0.2 |