| Sources | Concentration of heavy metals in sediment | References | |||||
|
| Pb | Cr VI | Mn | Cd | Cu | Fe |
|
| Sediments of Chari, Logone, Chad | 53.99 × 10−3 | 0.166 | 0.6 | <0.025 | 0.873 | 2.601 | Present study |
| Lake Nangbeto sediments, Togo | 4.835 | 5.875 | ND | 0.055 | 10.645 | ND | Adje et al., 2021 |
| N’zi River sediments, Ivory Coast | 0.652 | ND | ND | 0.485 | 14.73 |
| Ouattara et al., 2021 |
| Little Akaki River sediments, Ethiopia | 129.68 | 109.51 | ND | 3.14 | ND | ND | Mekuria et al., 2020 |
| Weihe River sediments, China | 24.44 | 109.98 | 888.29 | ND | 52.37 | ND | Muhammad et al., 2020 |
| OuedBoumerzouk sediments, Algeria | ND | ND | ND | 0.44 | 43.61 | ND | Dounia et al., 2019 |
| Sediments of the Ebrié Lagoon, Ivory Coast | 118.88 | ND | ND | 0.75 | 54.02 | ND | Irié Bi et al., 2019 |
| Lake Chad sediments, Nigeria | 113.53 | 82.41 | 1208.09 | 1.825 | 19.37 | 62602.5 | Jonathan et al., 2016 |
| Sediments of the BouRegreg Estuary, Morocco | 128.05 | 21.49 | ND | 2.90 | 33.48 | 19517.50 | Nadem et al., 2015 |
| Sediments of the Boumerzouk Basin, Algeria | 66.23 | 46.82 | ND | 1.19 | 52.19 | ND | Leila et al., 2014 |
| Turag River sediments, Bangladesh | 32.78 | 43.02 | ND | 0.28 | 50.40 | ND | Banu et al., 2013 |
| Tigris River sediment in Baghdad, Iraq | 34.33 | ND | 265.16 | 0.736 | 29.33 | ND | Rabee et al., 2011 |
| Sediment from Tsurumu River, Japan | 40.8 | 102.9 | ND | 1.0 | 133.0 | ND | Mohiuddin et al., 2010 |