| Heavy metal | WHO/FAO limit (mg∙kg−1) | Lemon | Avocado | ||
| Lower | Upper | Lower | Upper | ||
| Fe | 50 | 3.15 | 5.41 | 3.61 | 5.58 |
| Cu | 75 | 2.13 | 5.24 | 3.40 | 4.17 |
| Co | 50 | 0.12 | 0.31 | 0.08 | 0.29 |
| Mn | 20 | 1.15 | 3.88 | 1.49 | 4.03 |
| Fe | 0.5 | 0.16 | 0.22 | 0.21 | 0.35 |
| Cu | 0.8 | 0.04 | 0.06 | 0.14 | 0.17 |
| Mn | 2.0 | 0.05 | 0.05 | 0.04 | 0.24 |