Ten sediment samples were collected from Ajakanga stream in Ibadan in order to determine concentration, spatial distribution and assess the pollution status of the heavy metals, Zn, Cr, Co, Pb, Cu and Ni.The samples were analyzed using the Inductively Couple Plasma Mass Spectrometer. The mean concentrations are 66.750ppm for Zn, 37.833ppm for Cr, 23.083ppm for Co, 18.750ppm for Pb, 14.583ppm for Cu and 12.000ppm for Ni. To assess pollution in the sediments, sediment quality guideline were applied. The mean concentrations of Pb, Cu, Ni and Zn were below the USEPA guideline, while that for Cr exceeded that of the guideline. Based on evaluation using geoaccumulation index, all the metals have low to moderate contamination, while the enrichment factor showed that the entire content of Ni and Cr in the stream sediments were derived from natural sources.Pb, Zn, Cu and Co concentrations in the sediments have anthropogenic input.Ni and Cr are deficient to minimally enriched in the sediments. Cu and Co are moderately enriched, while Pb and Zn are significantly enriched.The contamination factor for Cu, Ni, Pb, Co and Cr is low, while that of Zn is moderate. Contamination degree calculated for the stream sediments also indicated a low degree of contamination. The ecological risk index and potential ecological risk index is low,indicating that the risk of potential contamination of Ajakanga stream sediments with the current concentration of Cu, Ni, Pb, Zn, Co and Cr is low.
Stream sediment, Pollution, Ajakanga, Geo accumulation index, Enrichment factor, Ecological risk index
Roland Anthony Isibor , Joseph Ayofe Aderogbin , Odunayo Jumoke Oyebode "Geochemical Evaluation of Heavy Metal Impact on the Stream Sediments of Ajakanga area, Ibadan, Southwestern Nigeria" Iconic Research And Engineering Journals Volume 3 Issue 11 2020 Page 149-162
Roland Anthony Isibor , Joseph Ayofe Aderogbin , Odunayo Jumoke Oyebode "Geochemical Evaluation of Heavy Metal Impact on the Stream Sediments of Ajakanga area, Ibadan, Southwestern Nigeria" Iconic Research And Engineering Journals, 3(11)