Levels and human health risk assessment of persistent organics, metalloid and heavy metals in fish

Abstract

Concentrations of Persistent organics (Polycyclic aromatic hydrocarbons  (PAHs), polychlorinated biphenyls (PCBs), metalloid (As) and heavy metals (Fe, Zn, Mn, Cu, Ni, Cd. V, Cr, Pb, Hg) were measured in fish (Clarias  gariepinus) samples collected from selected stations (S1, S2 and S3) along the stretch of Ovia River, Southern Nigeria, to assess the potential risks to humans consuming fish from the river. Acenaphthylene (AcPY), PCB 18 and iron (Fe) were the most dominant residues with mean concentrations ranging from 0.002 to 0.128, 0.001 to 0.003 and 175.97 to 255.52 mg/kg respectively. The most carcinogenic PAH, Benzo(a)pyrene (BaP) in S3, all the PCB congeners, cadmium (Cd), and lead (Pb) concentrations in the three stations were observed to be above EU recommended guideline values for food safety. Concentrations of dioxin‐like PCB congeners, 77, 105, 114 and the sum of carcinogenic PAHs also contributed to the toxic burden of these contaminants in fish. The estimated cumulative THQ for the assessed metalloid and heavy metals indicates health risks from exposure to metalloid and Heavy metals through fish consumption.

Keywords: Fish, PAHs, PCBs, Metalloid, Heavy metals, Health Risk