Risk assessment of human exposure to polycyclic aromatic hydrocarbons via shrimp (Macrobrachium felicinum) consumption along the Imo River catchments, SE Nigeria.

Autor: Dosunmu MI; Environmental/Petroleum Geochemistry Research Group, Department of Pure and Applied Chemistry, University of Calabar, Calabar, Nigeria., Oyo-Ita IO; Environmental/Petroleum Geochemistry Research Group, Department of Pure and Applied Chemistry, University of Calabar, Calabar, Nigeria. inyangoyoita@yahoo.com., Oyo-Ita OE; Environmental/Petroleum Geochemistry Research Group, Department of Pure and Applied Chemistry, University of Calabar, Calabar, Nigeria.
Jazyk: angličtina
Zdroj: Environmental geochemistry and health [Environ Geochem Health] 2016 Dec; Vol. 38 (6), pp. 1333-1345. Date of Electronic Publication: 2016 Jan 20.
DOI: 10.1007/s10653-016-9799-z
Abstrakt: Shrimp species (Macrobrachium felicinum) collected from estuarine mangrove area of the Imo River is an important route of exposure to polycyclic aromatic hydrocarbons (PAHs). The estuarine associated sediment (EAS) composited sample showed higher TPAH, ΣAlkyl, ΣPAH carc and ΣPAH EPA concentrations (550.84, 172.36, 413.17 and 482.11 ng/g dry weight-dw) than their mean concentrations in shrimp samples (509.39 ± 354.21, 31.38 ± 18.49, 52.10 ± 1.35 and 460.06 ± 330.76 ng/g wet weight-ww), respectively. Among the individual PAHs congeners, phenanthrene was the dominant species detected in the EAS accounting for 21.02 % of the total PAH load and the decreasing order of 3- > 2- > 5- > 4- > 6-ring contamination was found. A different pattern predominated by naphthalene was observed for the shrimp species, suggesting that the organisms have different selectivity for a range of PAHs congeners. These variations may be attributed to different degree of bioavailability of these compounds, characteristic sandy lithology of the EAS and the protective capacity of soot particles associated with liquid fossil fuel combustion masking the uptake of high molecular weight PAHs by the organisms. Cancer risk associated with consumption of shrimps in the region was assessed using estimated daily intake (EDI) and compared with standards. The EDI values for naphthalene, benzo(a)pyrene and ∑PAH carc were lower than the USEPA benchmarks and EFSA levels of concern values for adult and children population, suggesting low probability of developing cancer.
Databáze: MEDLINE
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