Assessment of Physico-Chemical Characteristics of Water in Agodi Reservoir, Ibadan, Nigeria

Physico-chemical analysis of water in Agodi Reservoir in Ibadan, Oyo State was carried out in the rainy and wet seasons using standard methods. The mean values of the parameters measured were compared with the WHO permissible concentrations. One-way ANOVA was used to test for location differences and seasonal variations. The mean values of Total Suspended Solids (TSS) 280.46mg/L, Total Dissolved Solids (TDS) o o 420.25mg/L, Temperature (T C) 27.71 C, pH 7.58 Electrical 2 Conductivity (EC) 213.34µs/cm, Sulphate (SO ) 0.03mg/L, Phosphate 4 3 4 (PO ) 0.04mg/L, Nitrate (NO ) 0.03mg/L, Chloride (Cl) 0.03mg/l, Total 3 Hardness (TH) 190.07mg/L, Alkalinity (Alk) 183.44mg/L, Dissolved Oxygen (DO) 7.84mg/L, Biochemical Oxygen Demand (BOD) 0.54mg/L and Chemical Oxygen Demand (COD) 86.00mg/L were recorded. Analysis of variance (ANOVA) showed no significant difference in the mean values of all the parameters except for BOD at the test locations. Seasonally, there was no significant difference in the two seasons except in TH. Compared to WHO recommended limits, Temperature TH and COD were above the recommended limits for drinking water. In conclusion, the values obtained for other parameters were within the recommended values of WHO for survival of organisms in an aquatic ecosystem.