Table 4.
Different permissible values of heavy metals in rice.
| Metal symbol | EWI imported (µg kg−1 BW) | EWI Iranian grown (µg kg−1 BW) | PTWI*** (µg kg−1 BW) |
|---|---|---|---|
| Cd | 1.69 | 2.05 | 7 |
| Pb | 7.06 | 2.52 | 25 |
| As | 0.73 | 0.59 | 15 |
| Cr | 7.83 | 3.72 | 23.3 |
| Zn | 44.4 | 335.34 | 420 |
| Ni | 9.75 | 2.82 | 35 |
| Cu | 26.69 | 205.33 | 500 |
| Co | 3.72 | 3.72 | Not set*** |
* ISRI (No: 12968),
**Human body weight,
*** FAO/WHO.
****No PTWI set for Co has been provided there Maximum Tolerable Daily
Intake is (MTDI) value of 0.1 mg kg−1 body weight (=700 µg kg−1 body weight in a week) for this element [5].