Table 1 Mean concentrations of physical and chemical characteristics in the main agricultural drains and some Wells in Siwa Oasis, (D1 − 3) and wells (W1 − 17).
Samples no. | Hydrographic measurements | Oxygen measurements | Major anions (mg/L) | Major cations (mg/L) | Nutrient salts | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
pH | Temp °C | EC mS/cm | Sal (‰) | Turb. (NTU) | TDS g/L | DO mg/L | BOD mg/L | COD mg/L | HCO3− | SO42− | Cl− | Ca2+ | Mg2+ | Na+ | K+ | NO2− -N µg/L | NO3−-N µg/L | NH4+- N µg/L | PO4 − 3 - P µg/L | TP-P µg/L | SiO2-Si mg/L | |
Agricultural drains | ||||||||||||||||||||||
D1 | 7.53 | 18.36 | 13.93 | 8.42 | 4.4 | 9.21 | 2.4 | 1.8 | 12.0 | 210 | 1103 | 4325 | 725 | 950 | 1681 | 301 | 16.9 | 208.6 | 225.3 | 240.5 | 1202.7 | 6.7 |
D2 | 7.75 | 17.90 | 16.34 | 9.63 | 1.2 | 10.24 | 4.0 | 1.8 | 5.0 | 300 | 1031 | 5018 | 517 | 998 | 2014 | 339 | 4.5 | 484.3 | 28.8 | 206.1 | 1030.5 | 8.6 |
D3 | 7.80 | 17.81 | 11.31 | 6.36 | 1.2 | 6.77 | 6.0 | 2.0 | 2.6 | 205 | 998 | 3061 | 417 | 631 | 1344 | 215 | 6.1 | 872.7 | 55.0 | 219.5 | 1097.6 | 7.5 |
Groundwater wells | ||||||||||||||||||||||
W01 | 7.65 | 23.60 | 8.26 | 4.59 | 0.3 | 4.74 | 2.8 | 1.6 | 16.2 | 140 | 498 | 2323 | 273 | 224 | 1218 | 148 | 2.8 | 194.1 | 147.1 | 119.7 | 598.4 | 1.1 |
W02 | 7.72 | 25.81 | 6.69 | 3.60 | 4.4 | 3.91 | 4.4 | 1.4 | 9.0 | 120 | 439 | 1789 | 120 | 215 | 1032 | 116 | 3.5 | 251.0 | 64.7 | 87.7 | 438.5 | 2.0 |
W03 | 7.95 | 26.77 | 1.71 | 0.86 | 1.0 | 0.93 | 4.0 | 2.2 | 4.6 | 100 | 115 | 317 | 80 | 58 | 171 | 64 | 6.9 | 304.5 | 45.3 | 25.1 | 125.3 | 2.6 |
W04 | 7.81 | 18.35 | 8.47 | 4.74 | 2.8 | 5.12 | 3.2 | 1.4 | 4.6 | 125 | 755 | 2282 | 281 | 346 | 1072 | 184 | 4.9 | 236.8 | 113.3 | 111.0 | 555.0 | 1.0 |
W05 | 7.70 | 17.75 | 6.89 | 3.40 | 5.2 | 3.73 | 3.6 | 1.6 | 7.2 | 150 | 582 | 1560 | 200 | 280 | 857 | 110 | 7.0 | 284.0 | 46.6 | 116.3 | 581.6 | 3.2 |
W06 | 7.75 | 16.52 | 10.36 | 5.80 | 4.6 | 6.33 | 3.6 | 1.2 | 11.8 | 230 | 1131 | 2549 | 317 | 509 | 1298 | 198 | 4.7 | 211.5 | 47.0 | 186.2 | 930.9 | 4.2 |
W07 | 6.81 | 23.66 | 6.57 | 3.60 | 2.3 | 3.99 | 3.2 | 1.6 | 18.2 | 125 | 536 | 1827 | 224 | 214 | 982 | 136 | 3.8 | 231.9 | 275.2 | 107.3 | 536.4 | 2.7 |
W08 | 7.79 | 16.01 | 8.44 | 4.73 | 1.0 | 5.16 | 3.6 | 1.0 | 8.6 | 325 | 699 | 2127 | 161 | 424 | 1154 | 158 | 2.2 | 1065.4 | 24.3 | 179.7 | 898.6 | 7.0 |
W09 | 7.82 | 24.52 | 3.20 | 1.67 | 0.5 | 2.08 | 2.4 | 1.2 | 10.8 | 115 | 152 | 964 | 74 | 157 | 465 | 86 | 1.8 | 222.4 | 81.1 | 88.3 | 441.7 | 2.5 |
W10 | 8.23 | 18.58 | 5.15 | 2.79 | 1.0 | 3.15 | 4.0 | 0.8 | 7.6 | 75 | 347 | 1418 | 160 | 146 | 756 | 118 | 3.7 | 169.3 | 41.5 | 89.3 | 446.6 | 3.0 |
W11 | 7.92 | 24.92 | 2.69 | 1.39 | 2.7 | 1.58 | 2.8 | 1.2 | 10.6 | 125 | 255 | 609 | 88 | 141 | 318 | 57 | 2.4 | 449.9 | 70.3 | 71.0 | 355.0 | 2.7 |
W12 | 8.75 | 18.66 | 0.50 | 0.24 | 13.1 | 0.27 | 3.2 | 1.2 | 5.4 | 75 | 25 | 65 | 16 | 27 | 43 | 15 | 5.8 | 376.2 | 64.4 | 9.0 | 44.8 | 3.8 |
W13 | 7.44 | 26.14 | 12.97 | 7.46 | 0.3 | 7.92 | 2.4 | 1.4 | 5.8 | 155 | 1275 | 3325 | 353 | 672 | 1824 | 233 | 1.8 | 181.8 | 48.9 | 195.0 | 975.2 | 2.9 |
W14 | 7.49 | 23.91 | 11.75 | 6.70 | 0.6 | 7.18 | 1.6 | 1.2 | 0.6 | 175 | 987 | 3145 | 361 | 792 | 1384 | 172 | 5.4 | 827.4 | 51.9 | 197.5 | 987.4 | 1.8 |
W15 | 7.70 | 22.29 | 11.49 | 6.36 | 1.1 | 6.88 | 2.4 | 1.2 | 10.2 | 160 | 979 | 3045 | 361 | 668 | 1388 | 183 | 7.7 | 576.2 | 65.6 | 195.7 | 978.6 | 6.2 |
W16 | 7.61 | 42.69 | 0.31 | 0.14 | 2.7 | 0.16 | 1.2 | 0.2 | 10.6 | 90 | 9 | 13 | 8 | 15 | 20 | 9 | 2.7 | 288.0 | 39.2 | 10.7 | 53.6 | 1.8 |
W17 | 7.28 | 24.26 | 11.52 | 6.37 | 1.4 | 7.02 | 2.4 | 1.2 | 0.6 | 160 | 931 | 3045 | 477 | 658 | 1341 | 169 | 4.7 | 1562.8 | 43.8 | 186.2 | 930.9 | 2.2 |
