Table 7.
Statistical values of observed HM concentrations (µg l−1) in the study area (N = 72).
| Al | Cr | Mn | Co | Ni | Cu | Zn | Cd | Pb | |
|---|---|---|---|---|---|---|---|---|---|
| Range | BDL–27.4 | 0.26–4.5 | BDL–139 | 0.02–0.9 | 0.4–5.5 | 0.07–9.2 | BDL–4164 | BDL–0.8 | BDL–11.2 |
| A.M. ± S.D | 3.5 ± 5 | 1.6 ± 0.8 | 9.8 ± 26 | 0.1 ± 0.1 | 1.6 ± 0.9 | 1 ± 1.8 | 329 ± 586 | 0.1 ± 0.18 | 0.9 ± 1.9 |
| Skewness | 3.19 | 0.87 | 3.34 | 3.51 | 1.41 | 3.45 | 4.47 | 3.03 | 3.33 |
| Kurtosis | 11.91 | 1.01 | 11.60 | 13.09 | 3.44 | 11.91 | 25.88 | 9.12 | 12.52 |
| MPL (BIS) | 200 | 50 | 300 | – | 20 | 1500 | 15,000 | 3 | 10 |
| MPL (WHO) | 200a | 50 | 400 | – | 70 | 2000 | 4000f | 3 | 10 |
| MPL (USEPA) | – | 100 | – | – | – | 1300 | – | 5 | 15 |
fLegal limit for water intended for the consumption of infant.