Table 2 Physicochemical properties of the water samples collected from Thunukkai, Mullaitivu District, Sri Lanka
Water quality parameter | Control (Mean ± SDa) | Samples | SLSb 614 (2013) | % of water sample exceeding SLS value | ||
|---|---|---|---|---|---|---|
Max | Min | Mean (±SD) | ||||
Turbidity (NTUc) | 0.38 ± 0.09 | 26.5 | 0.3 | 2.3 ± 4.41 | 2 | 28.8 |
pH | 8.0 ± 0.0 | 9.1 | 7.4 | 8.2 ± 0.4 | 6.5–8.5 | 17.1 |
Electric conductivity (μS/cm) | 935.67 ± 238.7 | 6900 | 330 | 1413.31 ± 1275.4 | 750 | 17.1 |
Salinity (g/L) | 0.416 ± 0.13 | 3.36 | 0.13 | 0.69 ± 0.70 | 0.5 | 50 |
TDSd (mg/L) | 418 ± 0 | 3750 | 136.3 | 687 ± 681 | 400 | 63.16 |
Nitrate (mg/L) | 51.66 ± 31.50 | 295 | 0 | 28.13 ± 53.31 | 50 | 15.17 |
Fluoride (mg/L) | 0.37 ± 0.24 | 22.3 | 0.1 | 1.73 ± 4.10 | 1 | 39.5 |
Phosphate(mg/L) | 3.1 ± 2.12 | 4.84 | 0.06 | 0.84 ± 0.64 | 2 | 10.6 |
Total hardness(mg/L) | 340.2 ± 76.1 | 683.2 | 39.84 | 295.76 ± 147.52 | 250 | 65.4 |
Magnesium(mg/L) | 29.28 ± 5.89 | 68.13 | 0 | 30.19 ± 1.87 | 50 | 18.42 |
Calcium(mg/L) | 86.36 ± 22.98 | 193.22 | 3.98 | 64.074 ± 43.20 | 100 | 21.05 |
Sodium(mg/L) | 7.2 ± 5.43 | 41.6 | 0.1 | 13.52 ± 11.46 | 200 | 0 |
Potassium(mg/L) | 4.8 ± 4.16 | 9.6 | 1.3 | 3.75 ± 2.00 | 10 | 0 |
Sulphate(mg/L) | 13.3 ± 7.63 | 160 | 0 | 37.10 ± 31.35 | 250 | 0 |
Alkalinity(mg/L) | 6.37 ± 1.26 | 31.87 | 2.46 | 7.2496 ± 5.41 | 200 | 0 |
Chloride(mg/L) | 184.96 ± 139.9 | 2066.53 | 6.95 | 367.27 ± 514.75 | 250 | 31.42 |
Arsenic (lowest detected value) (mg/L) | Less than 0.0001 ± 0 | 0.03 | Less than 0.0001 | 0.0054 ± 0.0051 | 0.01 | 23.7 |
Cadmium (μg/L) | Not detected | Not detected | 0.003 | 0 | ||