|| ABSTRACT | Volume 1, Issue 5, Pages 193-196 (July 2015)|
ASSESSMENT OF BIOACCUMULATION OF SOME HEAVY METALS IN TILAPIA ZILLI AND CLARIAS ANGUILLARIS FROM WUDIL RIVER, KANO-NIGERIA
| Labaran Ibrahim |. The American Journal of Innovative Research and Applied Sciences. 2015; 1(5)193-196.
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Background: Heavy metals are metallic chemical elements with a relatively density and toxic or poisonous to health because they are not degraded by the living body, hence, tends to accumulate over time. Objectives: This study was undertaken to determine the levels or concentrations of some heavy metals; Lead (Pb), Nickel (Ni), Cadmium (Cd), Iron (Fe) and Zinc (Zn) in the two (2) fish species; Tilapia zilli and Clarias anguillaris with weight of 95.00g and 98.98g respectively, obtained from Wudil-river, Kano-Nigeria. Methods: The mean concentrations of the heavy metals present were determined using PerkinElmer Analyst 300 Atomic Absorption Spectroscopy (AAS). A calibration plot of absorbance against concentration of each element under investigation was constructed and finally the concentration of each element was determined from calibration curve by extrapolation. Results: The results of this work indicated that the concentrations of (Pb) was found to be 0.34 mgdm-3, (Ni) 1.15 mgdm-3, (Cd) 1.42 mgdm-3, (Fe) 1.42 mgdm-3, and (Zn) 1.20 mgdm-3 in Tilapia zilli, while, (Pb) concentrations in Clarias anguillaris was found to be 0.30 mgdm-3, (Ni) 2.01 mgdm-3, (Cd) 1.14 mgdm-3, (Fe) 2.42 mgdm-3, and (Zn) 1.30 mgdm-3 respectively. The concentrations of Pb, Ni, Cd, and Fe in both specie of fishes were above the permissible limits of 0.05mg/dm3, 0.02mg/dm3, 0.80mg/dm3 0.30mg/dm3 respectively as recorded by United States Environmental Protection Agency (USEPA) and World Health Organization (WHO). However, (Zn) concentrations in two fishes were found to be below the permissible limits of 2.91mg/dm3 sets for heavy metals by the above named organizations. Conclusion: Therefore, the results of this work revealed clearly that the concentration of Pb, Ni, Cd, and Fe accumulated in the two fishes may be toxic or detrimental to health, since above the tolerable or permissible limits.
Keywords: Fish species, Concentrations, Permissible limits, Results, Absorbance, Cadmium