| Samples | Pb | Cd | Hg | TCR |
| Manihot esculenta peel | 1.7E−05 | − | − | 1.7E−05 |
| Manihot esculenta tuber flesh | 3.4E−05 |
| − | 3.4E−05 |
| Carica papaya peel | 1.7E−05 | − | − | 1.7E−05 |
| Carica papaya flesh | 1.7E−05 | − | − | 1.7E−05 |
| Zea mays husk | 2.6E−05 | − | − | 2.6E−05 |
| Zea mays seed | 5.1E−05 | − | − | 5.1E−05 |
| Abelmoschus esculentus | 2.6E−05 | − | − | 2.6E−05 |
| STANDARD | 10−6 to 10−4 |
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