Table 3 Risk factors and potential ecological risk classification.
From: Soil heavy metal contamination assessment in the Hun-Taizi River watershed, China
\({E}_{r}^{i}\) | RI | Potential ecological risk |
|---|---|---|
<40 | <70 | low |
40–80 | 70–140 | moderate |
80–160 | 140–280 | considerable |
160–320 | high | |
≥320 | ≥280 | very high |
