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Title: Spatial Pattern of Pollution in Orle River Basin, S.W.Nigeria
Authors: Ikhile, C. I.
Keywords: DO
Total hardness
CS and TS
Issue Date: 2011
Publisher: Nigeria Geographical Association Journal (NGJ) New Series, University of Ibadan, Ibadan, Nigeria
Series/Report no.: 7(2);130-149
Abstract: The spatial pattern of pollution in Orle River Basin was investigated at two weekly intervals for eight months starting from November 1987 to June 1988. A total number of 336 samples were collected and analysed for indices measuring pollution which include Biochemical Oxygen Demand (BOD5 ), Dissolved Oxygen (DO), Chemical Oxygen Demand (COD) and total hardness. The aim was to ascertain the level of fitness of the water for human and the ecological environmental background. Results revealed that the Dissolved Oxygen (DO) and Biochemical Oxygen Demand (BOD5 ),increased in the downstream direction while total water hardness decreased in the downstream direction. There is little variation in DO, BOD 5 and COD from one stream to the other. Ojo River recorded the highest in DO, BOD 5 and COD followed by Orle River and then Edion River. Total hardness is highest at the Pre-Cambrian Basement (PCB) followed by the Tertiary Sedimentary (TS) and then Cretaceous Sedimentary (CS) rocks. DO and BOD5 is highest at the TS followed by the CS and then the PBC rocks. COD is highest at the TS, followed by the CS and then the PBC rock formations
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