Research Article
Seasonal Dynamics in Bacteriological and Physicochemical Water Quality of the Southern Gulf of Lake Tana
Table 4
Mean and standard deviation of physicochemical parameters measured at the Southern Gulf of Lake Tana (N = 3), 2021.
| Site | Par. Sea. | pH | Temp (°C) | Turb(NTU) | E.C(µS/cm) | TDS(ppm) | NH4 (mg/l) | NO3 (mg/l) | PO4 (mg/l) | DO (mg/l) | BOD5(mg/l) |
| S1 | Dry | 7.8 ± 01 | 25 ± 2 | 27.7 ± 3 | 203 ± 10.7 | 88 ± 13.1 | 0.2 ± 0.1 | 39.7 ± 5.2 | 0.06 ± 0.01 | 6.1 ± 0.5 | 4.5 ± 0.5 | | Wet | 7.9 ± 0.05 | 22.7 ± 1 | 11 ± 0.4 | 285 ± 1.5 | 148 ± 4 | 0.5 ± 0.2 | 36.3 ± 3.1 | 0.38 ± 0.05 | 4.7 ± 0.2 | 11.7 ± 3.1 |
| S2 | Dry | 7.9 ± 0.32 | 22.8 ± 0 | 23 ± 0.8 | 141 ± 11 | 71 ± 8.4 | 0.15 ± 0.2 | 33.2 ± 3.6 | 1.4 ± 1.2 | 6.4 ± 0.4 | 4 ± 1.3 | | Wet | 8.7 ± 0.1 | 25.3 ± 1.1 | 23.1 ± 2 | 167 ± 0.8 | 84 ± 0.1 | 0.16 ± 0.1 | 13.9 ± 1.7 | 0.14 ± 0.1 | 6.7 ± 0.15 | 13 |
| S3 | Dry | 8.2 ± 0.6 | 24.9 ± 0.7 | 22.9 ± 6 | 174 ± 22 | 81 ± 6.1 | 0.1 ± 0.07 | 26.7 ± 3.7 | 1.6 ± 0.5 | 6.2 ± 0.4 | 4.7 ± 1.5 | | Wet | 9.3 ± 0.06 | 24 ± 1.2 | 19.4 ± 1 | 146 ± 3.4 | 73 ± 0.1 | 0.37 ± 0.02 | 33 ± 2.5 | 0.31 ± 0.1 | 7.7 ± 0.3 | 11 ± 1.7 |
| S4 | Dry | 8.4 ± 0.4 | 25.6 ± 0.5 | 24.8 ± 4 | 193 ± 16 | 86 ± 13.1 | 0.16 ± 0.07 | 57.2 ± 8.6 | 0.58 ± 0.95 | 6.5 ± 0.5 | 5 | | Wet | 8.6 ± 0.2 | 21.9 ± 1.5 | 16 ± 0.3 | 146 ± 0.5 | 73 ± 0.1 | 0.59 ± 0.3 | 27 ± 2.5 | 0.47 ± 0.1 | 6.8 ± 0.5 | 23 ± 2.6 |
| S5 | Dry | 7.4 ± 0.2 | 23.5 ± 0.8 | 16.3 ± 3 | 123 ± 7.7 | 61 ± 4.9 | 0.12 ± 0.03 | 15 ± 13 | 0.02 ± 0.02 | 6.1 ± 0.5 | 2.8 ± 1.4 | | Wet | 9.3 ± 0.06 | 21.3 ± 0.6 | 18.7 ± 1.5 | 131 ± 0.1 | 66 ± 0.4 | 0.2 ± 0.27 | 8.1 ± 6 | 0.04 ± 0.04 | 7.6 ± 0.5 | 5.7 ± 1.5 |
| S6 | Dry | 7.4 ± 0.1 | 23 ± 0.7 | 14.9 ± 2 | 122 ± 9.9 | 71 ± 14.6 | 0.08 ± 0.07 | 4.5 ± 3.9 | 0.02 ± 0.02 | 6.7 ± 0.5 | 2.3 ± 0.6 | | Wet | 8.99 ± 0.1 | 22 | 27 ± 0.5 | 146.9 ± 3 | 74 ± 0.3 | 0.39 ± 0.15 | 30 ± 1.5 | 0.32 ± 0.95 | 7.9 ± 0.5 | 17 ± 2.5 |
| S7 | Dry | 7 ± 0.6 | 25 ± 0.7 | 18.4 ± 1.2 | 134 ± 9.6 | 58 ± 15.6 | 0.07 ± 0.06 | 6.1 ± 0.8 | 0.03 ± 0.03 | 6.3 ± 0.5 | 2.3 ± 0.6 | | Wet | 8.9 ± 0.2 | 21 ± 1 | 24.9 ± 0.2 | 139 ± 1.9 | 71 ± 0.1 | 0.32 ± 0.11 | 17 ± 1.5 | 0.12 ± 0.05 | 7.5 ± 0.5 | 22 ± 2 |
| S8 | Dry | 7.3 ± 0.9 | 24 ± 1.3 | 11.8 ± 1.7 | 116 ± 6.9 | 62 ± 6.7 | 0.03 ± 0.03 | 4.5 ± 3.9 | 0.02 ± 0.02 | 6.9 ± 0.6 | 4.0±0.5 | | Wet | 8.9 ± 0.02 | 20.7 ± 0.6 | 26.8 ± 0.6 | 157 ± 47 | 70.6 | 0.56 ± 0.01 | 34 ± 1.5 | 0.28 ± 0.04 | 6.7 ± 0.9 | 20.5 ± 3 |
|
|
Note. Par. = parameters; Sea. = season; Temp = temperature; EC = electrical conductivity; Turb = turbidity; TDS = total dissolved solids; DO = dissolved oxygen; BOD = biological oxygen demand; NO3 = nitrates; PO4 = phosphate; NH4 = ammonium; EPA 2001: PO4 0.5; NO3 = 50, conductivity = 1000, BOD5 = 5, pH = 5.5 to 8.5 for surface water.
|