Accumulation Profile of Heavy Metals in Fish Samples from Nsawam, Along the Densu River, Ghana

A. K. Anim ； E. K. Ahialey ； G. O. Duodu ； M. Ackah ； N. O. Bentil

《Research Journal of Environmental and Earth Sciences》 3卷1期 (2011/01) Pp. 56-60

並列摘要

The present study was carried out to investigate the accumulation profile of heavy metals in five fish species namely; Heterotis niloticus, Channa obscura, Hepsetus odoe, Tilapia zilli and Clarias gariepinus. Concentrations of Fe, Mn, Cu, Zn, Ca, Cd, and Pb were measured in all the sam ples analysed. Ni, Co and Cr however, recorded 80, 60 and 20% incidence respectively in the fish samples. The highest mean concentration, 110.56±0.86 mg/kg was recorded for Cu in Hepsetus odoe. Ni, Co, and Cr measured relatively lower concentrations from as low as ＜0.01 mg/kg, ＜0.005 mg/kg and ＜0.001 mg/kg respectively been their respective detection limits. The least detectable concentration, 0.08±0.01 mg/kg was measured for Pb in Clarias gariepinus. Most of the heavy metals were within the recommended maximum guidelines. The concentration of Cu measured in all the samples however, exceeded the FAO maximum limit of 30 mg/kg. Similarly, the concentration of Mn measured in all the fish samples exceeded the WHO limit of 0.5 mg/L in drinking water. All the concentrations measured for Pb, were below the FAO limit of 0.5 mg/kg except 0.94±0.30 mg/kg, measured in Hepsetus odoe which exceeded the limit. The mean of the total concentration of each metal in all the samples indicate that the concentrations of the heavy metals in the samples are generally well below and or within the respective recommended guidelines. Thus fish species from the Densu river, harvested at Nsawam are safe for human consumption.

並列關鍵字

Concentration ； detectable ； guideline ； incidence ； maximum limit ； species