Heavymetals in the Sediment of Ibiekuma Stream in Ekpoma, Edo State, Nigeria

Abstract

This study determined the concentrations of Fe, Cd, Cr, Cu, Mn, Ni, Pb, V and Zn in the sediment of Ibiekuma Stream in Ekpoma, Edo State, Nigeria. The contamination levels of the respective metals were varied and the range of monthly mean values in µg/g were Fe (236.9-876.32), Cd (0.01-0.36), Cr (0.08-0.14), Cu (1.05-1.97), Mn (11.16-15.42), Ni (0.020-0.35), Pb (0.11-0.92), V (0.008-0.017) and Zn (44.96-55.89). Metal seasonal mean values were not different except for Fe and Mn. The metal levels (except Cd) were lower than mean values for continental crust and unpolluted African inland water sediments and indicated that metal contamination in the stream might not pose immediate threats to the organisms therein and to people that utilize the stream for drinking and other domestic uses. However, because Cd levels were a bit elevated, close monitoring of metal pollution of the stream is recommended in view of possible future risks that Cd could pose in the system.