| Rivers | Sites | FC_Pb | FC_Cr | FC_Mn | FC_Cd | FC_Cu | FC_Fe | Im | PLI |
| Logon | S1 | 6.3 × 10−3 | 1.8 10−3 | 3.5 × 10−4 | Nd | 0.0717 | 5.424 × 10−6 | 0.013 | 0.0033 |
| S2 | 5 × 10−4 | 1.7 × 10−3 | 4.7 × 10−4 | Nd | 0.0017 | 1.25 × 10−4 | 0.0007 | 0.002 | |
| Chari | S1 | 0.0056 | 2.7 × 10−3 | 9.4 × 10−4 | Nd | 0.022 | 6.52 × 10−6 | 0.0052 | 0.0035 |
| S2 | 0.0005 | 0.0014 | 1.29 × 10−3 | Nd | 0.002 | 7.9 × 10−5 | 0.00087 | 0.0022 | |
| Confluent | S1 | 2.7 × 10−3 | 3.1 × 10−3 | 2.3 × 10−4 | Nd | 0.015 | 6.08 × 10−6 | 0.0035 | 0.0023 |
| S2 | 5 × 10−4 | 4.2 × 10−3 | 9.41 × 10−4 | Nd | 2.6 × 10−3 | 7.93 × 10−5 | 0.00138 | 0.0027 |