| Heavy metals content (ppm) in TEs | |||
Zn | Cd | Cu | Cr | |
Standard | 3.0 | 0.003 | 2.00 | 0.05 |
Ashulia | 0.6 | 0.004 | 0.30 | 0.10 |
Savar | 1.4 | 0.005 | 0.10 | 0.20 |
Tongi | 0.8 | 0.005 | 0.05 | 0.15 |