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ASSESSMENT OF HEAVY METAL IN SEDIMENT OF OROGODO RIVER, AGBOR, DELTA STATE



ABSTRACT

This study was carried out to examine heavy metals concentration in sediment of upstream and downstream of the entry of the sewage to the Orogodo River, Agbor, Delta state Nigeria . Samples were collected from upstream and downstream and were analyzed for Heavy metals (Cd, Cr, Cu, Fe, Pb, Ni, Ca, Mg, Co, Mn and Zn) by atomic absorption spectrophotometer. It shows the concentration of iron, cadmium, manganese, cobalt, chromium, zinc, magnesium, calcium, nickel, lead and copper in mg/kg in sediments sampled.Some specific physico-chemical characteristics, such as TDS, pH, Temperature and conductivity which are known to influence the interactions and dynamics of metals within the sediment. The mean value of the metals listed above in all the six locations gave 126.09mg/kg, 0.000mg/kg, 0.538mg/kg, 0.000mg/kg, 0.141mg/kg, 1.789mg/kg, 1.258mg/kg, 9.49mg/kg, 0.000mg/kg, 0.112mg/kg and 0.0827mg/kg respectively.. The result of the analysis It shown that the concentrations of heavy metal like Zn, Pb, Cr, Ca, Cu, Co, Mg, Mn, Cd and Ni in the sediment are low, but require monitoring to prevent an increase. Hence the concentration of Fe is higher when compared with the WHO and FEPA standard for sediment which may constitute risk to the environment. The concentration of heavy metal varies for the different locations. Based on the result of analysis, recommendation were offered to reduce the concentration of heavy metal of the river.



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