The contamination of pesticides in water, sediments, Clarias gariepinus, and Tilapia zilli from Ogbesse River was investigated to evaluate the pollution status and potential hazard in river system. A total of sixteen pesticides were analyzed using Gas Chromatography (GC) equipped with Electron Capture Detector (GC-ECD). The concentration of pesticide residues ranged from ND to 0.43 µg/l for water samples, 0.82 to 2.14 µg/kg dw for sediment, 0.04 to 2.34 µg/kg/ww for C. gariepinus and 0.02 to 1.73 µg/kg/ww for T. zilli. There was a clear dominance of the organochlorine; Hexachlorocyclohexane (α HCH, γ - HCH (lindane), β- HCH) in all matrixes. Ecological risk assessment of pesticide residues in water samples using the Risk Quotient deterministic method showed the likelihood of cause adverse effects for each fish species (RQ≥1). Human health risk assessment indicated that the consumption of contaminated fishes (C. gariepinus and T. zilli) could have potential health implications.
Key words: Pesticides, chromatography, risk quotient, estimated daily intake, hazard quotient, environmental exposure.
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