Table 3 Nemerow pollution index (NIPI), potential (\(E_{\text{r}}^{i}\)) and comprehensive (RI) ecological harm indices before bioremediation
Heavy metal | Trojan mine | Freda-Rebecca mine | Renny mine | Bindura mine | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
NIPI | \(E_{\text{r}}^{i}\) | RI | NIPI | \(E_{\text{r}}^{i}\) | RI | NIPI | \(E_{\text{r}}^{i}\) | RI | NIPI | \(E_{\text{r}}^{i}\) | RI | |
Mn2+ | 0.9 | 46.0 | 170.0 | 0.8 | 45.0 | 174.0 | 0.9 | 44.0 | 171.0 | 0.9 | 43.0 | 172.0 |
Cr2+ | 3.2 | 60.0 | 289.0 | 3.6 | 62.0 | 286.0 | 3.0 | 63.0 | 290.0 | 3.4 | 60.0 | 278.0 |
Pb2+ | 4.6 | 170.0 | 659.0 | 4.9 | 174.0 | 653.0 | 4.7 | 172.0 | 658.0 | 4.5 | 175.0 | 662.0 |
Fe3+ | 4.1 | 90.0 | 455.0 | 3.9 | 89.0 | 462.0 | 3.8 | 91.0 | 453.0 | 3.7 | 90.0 | 458.0 |
Cd2+ | 2.6 | 100.0 | 356.0 | 2.4 | 103.0 | 358.0 | 2.5 | 102.0 | 360.0 | 2.6 | 100.0 | 355.0 |