Table 3: Classification of Geo-accumulation index of the analyzed heavy metals in accordance with Delgado [44].
| Class | Geo-accumulation index | Enrichment from anthropogenic activities |
| 1 | 1-0 | Unpolluted to moderately polluted |
| 2 | 1-2 | Moderately polluted |
| 3 | 2-3 | Moderate to heavily polluted |
| 4 | 3-4 | Heavily polluted |
| 5 | 4-5 | Heavily to extremely polluted |
| 6 | > 5 | Extremely polluted |