Monitoring the Effect of Water pollution In Twelve Selected Water Dams in Osun State of South Western Nigeria

ABSTRACT

The level of water pollution by heavy metals ' (Cu, Xn, Co, Ni, As, Mn, Cd, Cr. !)hi in twelve selected water Dams in Osun state were determined in order to know their distribution and possible source into the dams. Their bottom sediment and water  were colIected for analysis. The result in sediment showed that .the concentration of Manganese is high in all the dams with values ranging from 21,27-775.39mgkg and it spreads across all the locations. Cobalt was detected only at one. location with c6ncentration of 3.01mdkg. The result in ' water ,analysis showed that the concentration of zinc is more than that of manganese, almost in all the Jams. The values detected were between 0.0618lng/kg and 0.5068mg/kg while. that of manganese was' between 0.01 1 2nlglkg and 0.1 887 mgllig. Cobalt and cadmium were not detected in all the dams. The variation in the concentration of these metals in sediment and water may be due to chemical factors such as solubility, ion exchange ratio and electrochemicaI deposition.