Yebpella G.G.*, Baba N.H., Magomya A.M. and Odoh R. Pages 1 - 8 ( 8 )
Atomic Absorption Spectrophotometer was applied to study the impact of human activities on the bed of River Benue, the second largest river in Nigeria. Sediments were collected at four distinct stations designated ST1 – ST4 representing areas impacted by various contaminants to different degrees. The sediments are generally slightly alkaline with pH value ranging from 7.98 - 8.53. The concentrations (mg/kg) of 7 metallic elements of environmental implications which includes Cd, Pb, Cu, Fe Mn, and Zn were determined. Mean level of metal pollutants of toxicological concern Cd and Pb were 0.05 and 1.26 mg/kg. The decrease in concentrations of the metals across sampling stations followed this sequence Fe > Mn > Pb > Zn > Cu > Cd. Levels of all under studied metallic contaminant were significantly higher in samples from station S4 followed by S1 compared to S2 and S3 with lower degree of human activities. Levels of metals associated with the exchangeable, reducible, oxidisable and residual fractions ranged from 0.083 to 199.959; 0.037 to 219.118; 0.040 to 168.850 and 0.037 to 116.409 respectively. The mobility factor of cadmium in all the sample stations ranges from 28.06 – 69.27 mg/kg. The high value of Cd and Zn in the exchangeable fraction could indicate high mobility rate and readily availability of these metals for uptake by aquatic organisms. The aim of the study was therefore to assess the impact of metallic contaminants on the sediment, evaluate the pollution status of the sediments by the application of geoaccumulation index and their mobility rate.
sediment, speciation, pollution index and metallic elements, mobility
Chemical Sciences Department, Federal University Wukari, Wukari, Taraba State, Chemical Sciences Department, Federal University Wukari, Wukari, Taraba State, Chemical Sciences Department, Federal University Wukari, Wukari, Taraba State, Chemical Sciences Department, Federal University Wukari, Wukari, Taraba State