Par* Unit Fissured-karstic aquifer Karstic aquifer Porous aquifer
Max Min Mean SD Max Min Mean SD Max Min Mean SD
pH   8.1 7.3 7.6 0.2 8.2 7.1 7.6 0.3 7.9 7.5 7.7 0.2
Eh mV 444 374 417 15 449 399 421 18 426 398 411.2 10
T °C 27.8 26.4 27.2 0.4 27.7 26.9 27.4 0.2 27.6 27.1 27.5 0.2
EC µS 711 458 546 56 1382 422 741 312 2190 325 787 716
TDS mg/L 462 297 355 37 898 274 482 203 1423 211 511 465
LDO mg/L 7.5 7.2 7.4 0.1 7.5 5.6 6.9 0.6 7.8 6.7 7.3 0.4
Ca mg/L 96.5 14.9 74.2 15.4 173.0 28.4 81.4 41.1 94.0 24.6 54.4 30.0
Mg mg/L 38.6 12.8 24.2 5.8 53.9 15.2 31.5 15.1 84.1 12.8 31.9 28.2
Na mg/L 88.7 0.2 5.7 18.1 48.6 2.2 21.8 16.9 239.2 3.6 61.0 89.0
K mg/L 1.2 0.4 0.7 0.2 1.7 0.7 1.1 0.4 2.7 0.4 1.3 0.9
HCO3 mg/L 415.6 263.8 311.8 32.5 374.3 194.0 284.3 55.2 393.7 172.8 269.8 90.6
SO4 mg/L 32.6 3.9 10.2 5.6 280.8 5.1 73.2 86.8 99.6 6.6 29.9 35.9
Cl mg/L 15.8 1.7 3.2 2.9 80.2 2.3 20.9 24.8 398.8 2.3 76.6 159
NO3 mg/L 10.9 1.1 4.4 2.7 27.0 3.8 10.3 7.2 27.4 10.3 15.1 7.0
F- mg/L 1.0 0.03 0.13 0.2 1.9 0.1 0.7 0.6 1.2 0.1 0.5 0.4
Li µg/L 12.4 0.8 2.4 2.5 18.1 1.9 9.6 6.1 22.5 3.0 9.7 7.1
Si mg/L 11.0 4.0 5.6 1.8 13.8 5.7 9.9 2.8 13.3 9.1 10.7 1.8
B mg/L 0.1 0.01 0.02 0.03 0.1 0.01 0.1 0.03 0.2 0.01 0.1 0.1
Al µg/L 18.0 0.9 2.9 3.7 3.9 1.0 1.7 0.8 3.0 1.3 1.9 0.6
Mn µg/L 5.8 <0.001 0.7 1.3 3.0 0.01 0.9 1.0 13.9 0.2 4.7 6.7
Fe µg/L 300.5 1.3 17.3 61.9 7.9 1.3 3.2 2.0 3.2 2.2 2.6 0.4
Ni µg/L 6.6 0.03 1.7 1.7 2.7 0.3 1.3 0.8 52.2 0.04 8.8 21.3
Cu µg/L 1.7 <0.001 0.2 0.5 2.3 <0.001 0.6 0.7 0.4 <0.001 0.01 0.3
Zn mg/L 1.0 0.01 0.2 0.3 2.6 0.01 0.4 0.8 0.2 0.001 0.1 0.1
Se µg/L 2.8 0.3 0.9 0.7 1.5 0.2 0.7 0.5 2.7 0.03 0.7 1.0
Sr mg/L 4.0 0.1 0.4 0.8 12.9 0.2 5.2 5.0 1.7 0.3 0.9 0.5
Cd µg/L 0.1 0.002 0.03 0.04 0.1 0.002 0.001 0.003 0.003 <0.001 0.01 0.01
As µg/L 2.9 0.1 0.7 0.7 2.1 0.3 0.9 0.6 1.9 0.2 0.8 0.6
Ba mg/L 0.3 0.02 0.04 0.1 0.2 0.02 0.1 0.1 0.1 0.02 0.05 0.04
Pb µg/L 0.9 0.04 0.2 0.2 0.4 0.04 0.1 0.1 0.2 0.03 0.1 0.1
U µg/L 4.6 0.6 1.3 1.0 3.5 0.7 1.4 0.8 2.0 0.6 1.2 0.5
Na % 66.8 0.3 4.5 13.6 40.1 2.2 16.5 13.6 47.4 3.4 26.1 18.1
SAR meq/L 3.3 0.001 0.2 0.7 1.3 0.05 0.5 0.4 3.6 0.1 1.2 1.3
RSC meq/L 2.5 -2.2 -1.1 0.9 0.8 -7.9 -2.0 2.6 1.0 -5.2 -1.1 2.2
SSPP meq/L 2.8 -0.6 0.2 0.6 1.9 0.1 0.6 0.7 1.9 0.1 0.9 0.6
* Parameters
Table 6: Basic statistics of the chemical analysis and field parameters of groundwater samples in the three aquifers during dry season (SD means standard deviation, SAR
is sodium adsorption ratio, RSC is residual sodium carbonate, SSPP is soluble sodium percentage possible).
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