Recommended by | Maximum Permissible level (mg/kg) | Concentration (mg/kg) Wwb* | Heavy metals |
FAO (1992) EOSQC (1993)** | 2.0 0.1 | N.D*** | Lead (Pb) |
FAD (2001) (EOSQC, 1993) | 3.0 0.1 | N.D | Cadmium (Cd) |
FAO (1992) | 30.0 | 2.77 | Copper (Cu) |