Home – Home – Jornals – Chemistry for Sustainable Development 2011 number 4

A study was carried out between mid June-August, 2010 to estimate the level of organic pollution of the Odo Oba River in Osun and Oyo States. The parameters used to monitor the degree of pollution were Dissolved Oxygen (DO), Biochemical Oxygen Demand (BOD₅), Chemical Oxygen Demand (COD) and Permanganate Value (PV). 14 samples were collected along the water link, 200 m away from each other from the source to where the river discharges into the Asejire River. The values of DO, BOD₅, COD and PV ranged between 1.01-5.38, 04.2-24.2, 103-337 and 12-96 mg/L, respectively. The mean and standard deviation values were also (3.18±1.86), (15.35±6.59), (179±85) and (57.7±32.4) mg/L, respectively. The value of COD recorded from the analysis is greater than that of BOD₅. This suggests that the river contains a high proportion of biologically non-degradable and inert matter as a constituent of gross organic pollution. From the results of the analysis, the Odo Oba River is heavily polluted. The result of the analysis places the Odo Oba River water quality in class V of the Classical Prati Water Quality Index Scale.