Table 1 Levels of potential ecological risk for heavy metal in sediments
Range of \( E_{r}^{i} \) value | Level of single metal ecological risk | Range of RI value | Level of comprehensive potential ecological risk |
|---|---|---|---|
\( E_{r}^{i} \) < 40 | Low | RI < 150 | Low |
40 ≤ \( E_{r}^{i} \)< 80 | Moderate | 150 ≤ RI < 300 | Moderate |
80 ≤ \( E_{r}^{i} \) < 160 | Considerable | 300 ≤ RI < 600 | Considerable |
160 ≤ \( E_{r}^{i} \) < 320 | High | 600 ≤ RI | High |
320 ≤ \( E_{r}^{i} \) | Very high |  |  |