| Physico-chemical Parameters |
Sampling sites |
| S1 |
S2 |
S3 |
S4 |
S5 |
S6 |
Drinking water
Standard [12] |
| Lake water |
|
|
|
|
|
|
|
| pH |
7.7 ± 0.12a |
9.52 ± 0.19d |
9.17 ± 0.08cd |
8.86 ± 0.02bc |
9.14 ± 0.02cd |
8.5 ± 0.06b |
6.5-8.5 |
| DO (mg L-1) |
7.6 ± 0.12d |
6.6 ± 0.12bc |
6.2 ± 0.12ab |
6.9 ± 0.05c |
5.7 ± 0.17a |
6.1 ± 0.15ba |
4.5-7.5 |
| Temperature (0C) |
22.5 ± 0.41a |
26.7 ± 0.29c |
27.4 ± 0.23c |
27 ± 0.29c |
29 ± 0.12d |
25 ± 0.12b |
|
| TDS (mg L-1) |
562 ± 1.73c |
681 ± 0.58e |
507 ± 2.31a |
516 ± 0.58b |
603 ± 1.73d |
521 ± 2.31b |
1000 |
| EC (µS/cm K20) |
603 ± 1.73a |
895 ± 2.89f |
770 ± 1.16c |
785 ± 2.89d |
845 ± 2.89e |
642 ± 1.16b |
1500 |
| Sediment sample |
|
|
|
|
|
|
|
| pH |
6.64 ± 0.08a |
8.2 ± 0.10c |
7.95 ± 0.10c |
7.41 ± 0.15b |
8.19 ± 0.16c |
7.21 ± 0.01b |
|
| OM (%) |
4.3 ± 0.09b |
11.77 ± 0.26c |
2.96 ± 0.15a |
14.46 ± 0.26d |
3.30 ± 0.02a |
3.11 ± 0.01a |
|
|
| *Values with different letters showed significant differences (P<0.05, ANOVA), letter “a” indicates the smallest value for a given physico-chemical parameters (DO-dissolved oxygen concentration,TDS-total dissolved substances, EC-electrical conductivity (μS/cm K20 is μS/cm at 20°C ), pH hydrogen ion concentration and OM-organicmatter. |
| Table 1: Mean values of different physico-chemical parameters ± standard deviation (SD) of in-situ measurement of lake water, laboratory analysis of sediment samples of Lake Hawassa and standard values for drinking water |
