From: Investigating aquifer contamination and groundwater quality in eastern Terai region of Nepal
Parameters | Range | Mean | Standard deviation | Median | WHO guidelines | NDWQS guidelines | Samples not within limit | |
---|---|---|---|---|---|---|---|---|
Number | % | |||||||
Groundwater (N = 175) | ||||||||
 pH | 5.00–8.59 | 6.953 | 0.595 | 6.99 | 6.5–8.5 | 6.5–8.5 | 34 | 19.43 |
 Temp (°C) | 17.0–35.9 | 27.721 | 4.606 | 28.5 | – | – | – | – |
 EC (µS/cm) | 14.8–1898.0 | 445.500 | 264.949 | 436 | – | 1500 | (1) | (0.57) |
 Turbidity (NTU) | 0.00–149.00 | 12.729 | 21.756 | 3.29 | 5 | 5 | 78 | 44.57 |
 Color (Hazen) | 0.01–4.10 | 0.219 | 0.461 | 0.11 | 15 | 5 | 0 | 0 |
 TDS (mg/L) | 7.50–949.00 | 231.034 | 128.581 | 224 | 1000 | 1000 | 0 | 0 |
 F− (mg/L) | 0.02–1.10 | 0.235 | 0.216 | 0.16 | 1.5 | 0.5–1.5 | 0 (152) | 0 (86.86) |
 NH3 (mg/L) | 0.05–3.36 | 0.477 | 0.440 | 0.38 | 1.5 | 1.5 | 6 | 3.43 |
 NO3 (mg/L) | 0.05–3.38 | 0.266 | 0.569 | 0.05 | 50 | 50 | 0 | 0 |
 Cl− (mg/L) | 0.50–161.8 | 17.011 | 29.464 | 3.5 | 250 | 250 | 0 | 0 |
 TH (mg/L) | 1.11–510.00 | 191.644 | 87.865 | 205.35 | – | 500 | (1) | (0.57) |
 CH (mg/L) | 1.00–412.62 | 118.856 | 66.097 | 116.23 | – | – | – | – |
 TA (mg/L) | 2.36–512.40 | 197.678 | 89.929 | 213.06 | 500 | – | 1 | 0.57 |
 Fe (mg/L) | 0.05–23.10 | 1.836 | 3.642 | 0.46 | 0.3 | 0.3 | 107 | 61.14 |
 Mn (mg/L) | 0.05–3.10 | 0.367 | 0.486 | 0.21 | – | 0.2 | (88) | (50.28) |
 As (mg/L) | 0.005–.050 | 0.005 | 0.003 | 0.005 | 0.01 | 0.05 | 1 (0) | 0.57 (0) |
 Ca2+ (mg/L) | 0.00–165.05 | 45.137 | 26.218 | 41.281 | – | 200 | 0 | 0 |
 Mg2+ (mg/L) | 0.00–61.49 | 18.523 | 12.632 | 16.28 | – | – | – | – |