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.

Consumption Safety in Relation to Bioaccumulation of Heavy Metals in Periwinkles (Tympanotonus fuscatus) Obtained from Ogbia in the Niger Delta Region of Nigeria

“…Anaero-Nweke et al [25] in a study of bioaccumulation of heavy metals in tissues of Tympanotonus fuscatus had reported EDI range of 6.57-8.81 mgkg −1 above FAO/WHO [26] permission tolerable daily intake of 0.25 mgkg −1 for Pb and EDI values of 0.01-0.07 mgkg −1 within FAO/WHO [26] permissible tolerable daily intake of 0.07 mgkg −1 for Cd. Tongo and Ezemonye [18], had reported EDI values of 0.138-0.200 mgkg −1 in Figure 3. Estimated daily intake of the periwinkles is presented in the study area.…”