Heavy Metals Concentration In Upper Calabar River Sediments, South Eastern Nigeria
Copper, iron, lead, cobalt, nickel, zinc and vanadium were determined in sediment samples from Upper Calabar River, Cross River state of Nigeria. Heavy metals were determined from acid digested sediments using atomic absorption spectrophotometer. Mean value for Fe , Zn , Co and copper were higher than those for unpolluted sediments, an indication of possible anthropogenic contaminants. Significant positive correlation was found between cobalt and nickel (r = 0.955), Co and Fe (r = 0.899), Co and Cu (r = 0.887), Ni and Fe (r = 0.970), Ni and V (r = 0.694), Ni and Cu (r = 0.952), Fe and V (r = 0.598), Fe and Cu (r = 0.955) and V and Cu (r = 0.589, n = 12, P< 0.05) indicating strong metal associations. The results are comparable to levels in sediments from rivers in non-industrial areas and is thus attributed to natural geochemical inputs.