Table 1 International standard guidelines showing the maximum heavy metal content (mg/Kg) for some metals.
Sample nature | Available standards | Pb | Cd | Cu | Co | Fe | Cr | Ni | Ag | Zn | Mn | AS | Hg | Reference |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
*Drinking water | WHO | 0.01 | 0.003 | 2 | 2 | 0.3 | 0.05 | 0.020 | 3 | 0.5 | 0.01 | 0.001,0.006(IM) | ||
USEPA | 0.015 | 0.005 | 1.3 | - | 0.3 | 0.1 | - | 5 | 0.05 | 0.01 | 0.002 | |||
NEQS-Pakistan | < 0.05 | 0.01 | 2 | - | < 0.05 | < 0.02 | 3 | < 0.5 | < 0.05 | < 0.001 | ||||
***Daily dietary intake | - | 7-230 (adult) | 18.9 | **1-1.5 | - | **45 | 25–224 | < 1 | **5.2–16.2 | - | 50 | - | ||
Cosmetics | USFDA | *20 | *3 | 200 | < 170 | 50 | 10 | - | - | *3 | *1 | |||
*WHO | 2 | 1 | - | - | - | - | - | - | - | 0.01 | 3 | |||
Canada | 10 | 3 | - | - | - | 1 | - | - | - | 3 | 1 | |||
Germany | 0.5 | 0.1 | - | - | - | - | - | - | - | - | 0.1 | |||
EU | - | - | - | - | - | - | 10 | - | - | - | 0.5 | - |