Heavy Metals In Sediments of Some Inland Waters Adjacent To Benue Cement Company Plc, Benue State, Nigeria.
Heavy metals; Cadmium, Cobalt, Chromium, Copper, Lead, Manganese, Iron and Zinc were determined in sediments from Ahua Ijombo, Atser Kave, Ngo, Tsongor Bagidi and Tyonune surface waters adjacent to Benue Cement Company Plc. Gboko, Benue State, Nigeria using Atomic Absorption Spectrometry. Results of analysis showed that the concentrations of cobalt, copper, and lead ranged from non detectable to 15.0mg/kg, 5.0mg/kg and 20.0mg/kg respectively. Cadmium ranged between 3.0mg/kg and 8.5mg/kg, chromium between 50.0mg/kg and 88.0mg/kg, manganese between 25.0mg/kg and 79.4mg/kg, Iron between 1465.0mg/kg and 29750.0mg/kg while zinc ranged between 10.0mg/kg and 118.0mg/kg. The general trend in metal concentration was Fe>Cr>Mn>Zn>Cd>Pb>Cu>Co. Apart from Ahua Ijombo sediments and with the exception of chromium, the concentrations of metals studied were within the range specified by United States Enviromental Protection Agency (USEPA) and World Health Organization (WHO) for bottom sediments of water reservoirs. However, the high levels of chromium above recommended values in all the sediments and also, the high levels of all metals above recommended values in Ahua Ijombo indicate pollution. Also the high pH values recorded in these sediment suggests anthropogenic inputs of carbonate bearing substances from the cement factory. These surface waters appear to have suffered adverse impact from the cement company and therefore not suitable for human consumption.