Bioaccumulation of Some Heavy Metals in Fish Samples from River Benue in Vinikilang, Adamawa State, NigeriaReport as inadecuate




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This study was aim to determined the levels of some heavy metals in the gills, liver, stomach, kidney, bones and flesh of four fish species Tilapia zilli, Clarias anguillaris, Synodentis budgetti and Oreochronmis niloticus collected at River Benue in Vinikilang, Adamawa State, Nigeria for analysis of Cu, Zn, Co, Mn, Fe, Cr, Cd, Ni and Pb. These metals were chosen because at higher concentrations there might be toxic to the fish and by extension humans that depends on such fish as food. The concentrations of the metals were carried out using Flame Atomic Absorption Spectrophotometer AAS, Unicam 969. Large differences in trace metal concentrations were observed between different tissues within each fish. The highest concentration of Fe 12.65 μg-g was recorded in gill of Synodentis budgetti, while the lowest value of 0.68 μg-g was recorded in the flesh of Oreochronmis niloticus. The liver of Synodentis budgetti accumulates significant higher levels of Mn and Cd than other species; Fe and Zn was highest in the stomach of Tilapia zilli, while Clarias angullaris shows more of Cr, Pb, Cd and Co. The stomach of Synodentis budgetti accumulate significant higher levels of Fe than other species; Zn was highest in the stomach of Tilapia zilli, while Clarias angullaris shows more of Mn, Cr, Cu, Cd and Pb. Similarly, the bone of Synodentis budgettiaccumulates significant higher levels of Mn and Cd than other species; Zn and Fe were highest in the bone of Tilapia zilli, while Clarias angullaris shows more of Cr, Pb, Ni, and Co. The highest levels of Fe 12.65 μg-g observed in this study was recorded in the gill of Synodentis budgetti and it was below the high residue concentrations of Fe 34 - 107 ppm in fish samples. Based on the above results, it can therefore be concluded that metals bioaccumulation in the entire fish species study did not exceeds the permissible limits set for heavy metals by FAO, FEPA and WHO.

KEYWORDS

Bioaccumulation; Heavy Metals; Fish; Vinikilang; River Benue

Cite this paper

J. Akan, S. Mohmoud, B. Yikala and V. Ogugbuaja -Bioaccumulation of Some Heavy Metals in Fish Samples from River Benue in Vinikilang, Adamawa State, Nigeria,- American Journal of Analytical Chemistry, Vol. 3 No. 11, 2012, pp. 727-736. doi: 10.4236-ajac.2012.311097.





Author: Joseph Clement Akan, Salwa Mohmoud, Bashir Shettima Yikala, Victor Obioma Ogugbuaja

Source: http://www.scirp.org/



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