Risk assessment of human exposure to heterocyclic aromatic compounds in sediment dwelling biota from Ibeno River Catchment, Southeast, Nigeria
Résumé
Biota and associated sediment samples were collected from the Ibeno river catchment and analyzed using the standard methods for investigation of the sources and the distribution of heterocyclic compounds in the area. The lipid content values of the biota varied from 10-29% dry weight (dw; mean = 15.8 + 7.79) in Large crab (LC) and ranged from 5-10% dw (mean = 7.6 + 1.82) in small crab (SC). Also, it ranged from 6-10% dw (mean= 7.6 + 1.52) in small shrimp (SS) and varied from 7-40% dw (mean = 23.6 + 1.47) in large shrimp (LS). High TOC (4.5%) and TIC (2.53%) were found for the associated sediment, and this was because of the silty nature of the sediment, having high adsorption capacity for organic matter. The high extractible organic matter (EOM) value recorded for the associated sediment may be linked to petroleum hydrocarbon discharge into the environment by Exxon Mobil. The biota-sediment accumulation factor (BSAF) values ranged from 0.0029-0.0059 (mean = 0.0047 + 0.00128) for LC and 0.0059-0.0085 (mean = 0.00724+0.001276) for SC. On the other hand, the values ranged from 0.0060-0.0160 (mean = 0.0037 + 0.002787) and 0.0018-0.0084 (mean = 0.0096 + 0.004079) for LS and SS respectively. This low result reviews that the contaminant uptake from the associated sediment by the biota was negligible, hence, the consumers exposed to this biota might not have experienced any serious health risk associated with the consumption of heterocyclic aromatic hydrocarbons. The aromatic fractions from column chromatography would subsequently be subjected to gas chromatography mass spectrometry analysis to identify and quantify the individual heterocyclic aromatic hydrocarbons.
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