| Samples | Standards | Zn | Pb | Cd |
| Water (mg/L) | WHO/FAO (2007) | 2.0 | 5.0 | 0.01 |
| USEPA, 2010, USEPA., 2010 | 2.00 | 0.015 | 0.005 | |
| Soil (mg/kg) | WHO/FAO (2007) | 300 - 600 | 250 - 500 | 3.0 - 6.0 |
| USEPA, 2010, USEPA., 2010 | 200 | 300 | 3.0 | |
| Plant (mg/kg) | WHO/FAO (2007) | 60.0 | 5.0 | 0.2 |
| USEPA, 2010, USEPA., 2010 | – | – | – |