| Heavy metals (mg∙kg−1) | Site | |
| Tanghin | Paspanga | |
| Cd | 0.80 ± 0.01a | 0.19 ± 0.02a |
| Cr | 0.037 ± 0.001a | 0.03 ± 0.001a |
| Cu | 0.91 ± 0.02a | 0.27 ± 0.02a |
| Mn | 0.004 ± 0.00a | 0.06 ± 0.001a |
| Ni | 0.11 ± 0.01a | 0.13 ± 0.01a |
| Pb | 0.064 ± 0.002a | 0.04 ± 0.002a |
| Zn | 0.085 ± 0.003a | 0.057 ± 0.001a |