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. 2023 Sep 9;9(9):e19668. doi: 10.1016/j.heliyon.2023.e19668

Table 3.

Average concentration of various water quality indicators in groundwater.

GW1 GW2 GW3 GW4 GW5 GW6 GW7 GW8 GW9 ab bc
DGLa 2.50 2.75 3.23 3.66 3.00 3.35 2.85 3.05 3.66 3.66 4.20 3.66 3.75 4.00 4.25 3.35 2.95 3.10 – –
Para. Dry Wet Dry Wet Dry Wet Dry Wet Dry Wet Dry Wet Dry Wet Dry Wet Dry Wet
Temp. 25.0 29.2 23.0 29.0 17.0 28.4 19.3 28.3 21.0 28.1 22.0 29.3 20.0 30.4 18.6 30.4 19.8 30.5 – 20.0–30.0
pH 8.27 7.66 7.35 7.86 7.05 7.94 7.60 7.98 7.65 7.85 7.28 7.86 8.11 7.87 7.20 7.79 6.90 7.77 6.50–8.50 6.50–8.50
EC 800 876 980 1275 941 645 613 790 678 722 420 730 680 756 417 397 521 554 1500 1000
TDS 77.2 521 123 827 46.8 316 59.1 399 57.0 385 85.2 575 27.6 186 18.1 122 114 770 1500 1000
TA 110 125 103 75.0 95.0 50.0 44.0 66.7 167 158.3 187 316.7 148 150.0 235 41.7 198 58.3 100 –
TH 157 299 175 427 165 276 153 316 155 333 170 296 145 329 160 152 147 219 500 500
TOC 2.41 3.30 9.36 12.8 1.15 1.58 1.15 1.58 0.770 1.06 0.81 1.11 1.83 2.50 2.08 2.85 3.02 4.14 – –
HCO3− 55.4 61.9 50.3 36.1 46.4 23.2 23.8 31.8 68.0 79.0 98.3 161 76.7 74.7 123 18.9 97.5 27.5 500 –
Cl− 8.38 62.1 13.0 97.4 14.1 49.0 17.3 69.8 11.7 56.8 22.6 49.9 21.7 60.5 14.4 47.9 41.3 127 500 250
PO43− 2.19 3.61 7.73 12.8 13.32 22.0 4.10 6.76 3.27 5.40 2.34 3.86 11.6 19.2 4.10 6.77 57.8 95.4 – 6.00
SO42− NDd NDd 2.26 5.43 1.27 3.05 0.900 2.16 0.020 0.044 0.530 1.27 0.580 1.39 0.150 0.352 54.8 132 250 250
NO2− 0.180 0.540 0.223 0.670 0.180 0.540 0.257 0.770 0.237 0.710 0.170 0.510 0.397 1.19 0.197 0.590 0.310 0.930 3.00 1.00
NO3− 17.1 28.3 <1.00 12.7 <1.00 <1.00 2.67 <1.00 1.06 27.5 3.12 5.06 1.20 16.3 1.12 2.57 9.68 23.0 45.0 45.0
Na+ 25.5 68.7 57.2 154 22.6 60.9 25.8 69.6 16.7 45.1 8.93 24.1 17.7 47.9 16.8 45.3 103 279 200 200
K+ 32.0 183 26.9 208 12.4 95.5 18.8 145 14.1 87.9 16.0 99.8 15.7 97.9 14.8 92.6 28.4 177 12.0 12.0
Ca2+ 7.71 28.6 8.45 34.7 6.24 14.1 14.3 18.0 13.3 14.1 10.0 12.9 26.6 15.8 21.2 9.32 15.4 18.2 200 75.0
Mg2+ 34.9 19.6 35.4 19.9 28.7 16.1 35.5 19.9 34.1 19.2 34.6 19.5 35.3 19.8 16.3 9.14 28.5 16.0 50.0 35.0
a

Depth of Groundwater Level (m b.g.l.).

b

WHO standard for drinking water [59].

c

Bangladesh standard for drinking water [60].

d

Not Detected.