Table 3 Statistics of representative chemical parameters of groundwater in water source area from 2021 to 2023.
From: The present situation and pollution sources of underground drinking water in Zhangjiakou, China
Area | Item | pH | TDS | CODMn | \({\text{Cl}}^{-}\) | \({\text{F}}^{-}\) | Na+ | \({\text{SO}}_{4}^{2-}\) | \({\text{NH}}_{4}^{+}\) | \({\text{NO}}_{2}^{-}\) | \({\text{NO}}_{3}^{-}\) |
|---|---|---|---|---|---|---|---|---|---|---|---|
Gushi water source(GWS) | Minimum value | 7.50 | 340.00 | 0.43 | 29.90 | 0.21 | 0.03 | 14.40 | 0.02 | 0.00 | 1.22 |
Maximum value | 8.50 | 724.00 | 1.38 | 61.10 | 0.97 | 55.50 | 97.80 | 0.17 | 0.02 | 15.70 | |
Mean value | 8.01 | 477.57 | 0.83 | 41.01 | 0.71 | 34.41 | 76.55 | 0.03 | 0.00 | 10.97 | |
Standard deviation | 0.21 | 83.18 | 0.20 | 5.75 | 0.14 | 7.86 | 13.19 | 0.02 | 0.00 | 2.84 | |
Taobeiying water source(TWS) | Minimum value | 7.50 | 364.00 | 0.56 | 7.12 | 0.22 | 0.03 | 7.09 | 0.02 | 0.00 | 2.21 |
Maximum value | 8.40 | 672.00 | 1.34 | 75.40 | 0.93 | 46.10 | 110.00 | 0.19 | 0.02 | 17.80 | |
Mean value | 7.97 | 476.51 | 0.85 | 38.22 | 0.67 | 33.86 | 80.16 | 0.03 | 0.00 | 12.13 | |
Standard deviation | 0.21 | 67.43 | 0.17 | 8.83 | 0.11 | 7.21 | 17.85 | 0.03 | 0.00 | 2.55 | |
Yaozhanbu water source(YWS) | Minimum value | 7.40 | 380.00 | 0.20 | 17.90 | 0.40 | 0.04 | 51.40 | 0.02 | 0.00 | 6.49 |
Maximum value | 8.20 | 693.00 | 1.62 | 46.20 | 0.77 | 54.30 | 79.90 | 0.18 | 0.02 | 12.20 | |
Mean value | 8.00 | 463.80 | 0.56 | 31.30 | 0.61 | 43.57 | 62.67 | 0.03 | 0.00 | 7.55 | |
Standard deviation | 0.16 | 70.32 | 0.33 | 4.56 | 0.08 | 9.03 | 5.40 | 0.03 | 0.00 | 1.27 |
