Table 3 Concentration of selected heavy metals in raw water from a dam
Metal (loid) | Concentration in raw water (mg L-1) | W-Rlim or WHO standard (mg L-1) |
|---|---|---|
Arsenic (As) | 0.26 | 0.01 |
Lead (Pb) | 0.30 | 0.01 |
Zinc (Zn) | 4.82 | 3.0 |
Manganese (Mn) | 3.25 | 0.1 |
Cadnium (Cd) | 0.08 | 0.003 |
Chromium (Cr) | 0.02 | 0.05 |
Cobalt (Co) | 0.05 | Not provided |
Copper (Cu) | 0.26 | 2.0 |
Iron (Fe) | 0.21 | 0.3 |