Assessment of the exposure of two fish species to metals pollution in the Ogun river catchments, Ketu, Lagos, Nigeria |
| |
Authors: | A A Adeniyi K A Yusuf O O Okedeyi |
| |
Institution: | (1) Department of Chemistry, Lagos State University, Ojo, P.M.B 1087, Apapa, Lagos, Nigeria |
| |
Abstract: | The concentrations of metals (Ca, Cd, Fe, Mn, Pb and Zn) were determined by flame atomic absorption spectrophotometry in water,
sediments and fish samples in the Ogun river catchments, Ketu, Lagos, which is an important bird nesting, fishing and drinking
water source. The results show that the southern tip bothering the Lagos lagoon is where the highest metal concentrations
are found in the fish species (Tilapia sp. and Chrysichthys sp.), whereas the Agboyi creek segment near the lagoon with higher surrounding human population density recorded higher levels
of metals in sediments and water samples. The two fish species accumulated different amounts of metals. However, the differences
were not statistically different at p < 0.05. There is a significant correlation (p < 0.05) for Cd concentration in water. The concentrations of Pb in sampling points 3 and 4 as well as Cd, Mn and Fe in all
six sampling points exceeds the World Health Organization (WHO) limits for drinking water. Levels of metals obtained for sediments
are within the range reported for Nigeria’s river sediments. Based on this study, the human risks for heavy metals in the
harvested fish species from the Ogun river catchments, Ketu, are low for now as the concentrations were below the recommended
Food and Agriculture Organization (FAO) maximum limits for Pb (0.5 mg/Kg), Cd (0.5 mg/Kg), and Zn (30 mg/Kg) in fish. |
| |
Keywords: | Metals Fish Tilapia sp Chrysichthys sp Water River sediments |
本文献已被 PubMed SpringerLink 等数据库收录! |
|