| Gibbs Yaoundé | Wet season | Dry season | ||
| Ions | samples | % | Samples | % |
| Cations |
|
|
|
|
| Atmospheric precipitation dominance | 7 | 16 | 8 | 18 |
| Rock-weathering dominance | 38 | 84 | 37 | 82 |
| Anions |
|
|
|
|
| Atmospheric precipitation dominance | 9 | 20 | 11 | 25 |
| Rock-weathering dominance | 36 | 80 | 34 | 75 |
| Cation + Anion |
|
|
|
|
| Atmospheric precipitation dominance | 16 | 17.8 | 19 | 21 |
| Rock-weathering dominance | 74 | 82.2 | 63 | 79 |