Publisher: Chemical Society of Nigeria

Human Carcinogenic Risk Assessment of Polycyclic Aromatic Hydrocarbons In Freshwater Samples From Ogba/Egbema/Ndoni Communities In Rivers State, Nigeria

E. Inam, E. Owhoeke, J. Essien
KEYWORDS: Polycyclic aromatic hydrocarbons, Freshwater, Cancer Risk assessment, Ogba/Egbema/Ndoni Local Government Area


Freshwater samples from oil producing communities of Egi, Omoku and Egbema in Ogba/Egbema/Ndoni Local Government Area of Rivers State, Nigeria were examined for polycyclic aromatic hydrocarbons (PAHs) loads and the human carcinogenic risk of sixteen United State Environmental Protection Agency (US EPA) priority PAH suites. Determination of PAHs was done using gas chromatography/flame ionization detector (GC/FID) and the results show that the concentrations of PAHs in the water samples ranged from 1.38μg/L to 5.96μg/L with mean value of 3.33±0.18μg/L. The average total PAHs recorded for the three communities were Egi (3.39±0.17μg/L), Omoku (1.90±0.13μg/L) and Egbema (4.71±0.23μg/L) for Egi, Omoku and Egbema respectively. The dominant PAHs suites were benzo (b) fluoranthene, indeno (1, 2, 3-cd) pyrene, phenanthrene and benzo (k) fluoranthene. The cancer risk due to c-PAHs from ingestion of water was estimated using the standards given by the US EPA for 10years, 25years and 70years old and the results were 4.88E-5, 6.09E-5 and 6.87E-5 respectively. These values are within the range of the US EPA risk management criterion (10-6 to 10-4) where management decision should be considered. There is therefore need for mitigation actions to protect public health.

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