Table 4:
Selenium concentration in surface and ground waters from several countries
| Regions/countries | Water sources | Selenium concentration | Ref |
|---|---|---|---|
| India (Chandigarh) | Groundwater | 0.9 μg/L | (70) |
| Nigeria | Groundwater | 7.33 - 46.3 μg/L | (71) |
| India(Chennai) | Groundwater | 0.15–0.43 μg/L | (70) |
| Jordan | Groundwater | 0.09 - 0.74 μg/L | (72) |
| Ethiopia | Groundwater | 15–7600 μg/l | (73) |
| Finland | groundwater | 0.07 μg/L | (74) |
| China(Enshi) | groundwater | 0.17 μg/L | (74) |
| Canada(Saskatchewan River) | Surface water | 165–311 μg/L | (75) |
| Australia (Lake Macquarie) | Surface water | 50–300 μg/L | (35) |
| Belgium(Scheldt River) | Surface water | 0.23–1.78 μg/L | (76) |
| Brazil(Amazon River) | Surface water | 0.21 μg/L | (76) |