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Source Apportionment of Polycyclic Aromatic Hydrocarbons (PAHs) in a Tropical Estuarine Epipelic Sediment and Its Associated Bacterial Degrading Potentials

Nsikak A. Abraham, Nnanake-Abasi O. Offiong, Owen P. Ukafia, Patrick E. Akpan

Current Journal of Applied Science and Technology · pp. 1–11 · Published 25 Jan 2019

10.9734/CJAST/2019/42891

Abstract

The present study was designed to evaluate the distribution and sources of polycyclic aromatic hydrocarbons (PAHs) and the degradation potentials of bacteria associated with the Iko River estuarial epipelic sediment using standard analytical and microbiological techniques. The results of the analysis revealed that the mudflat of the ecosystem contained varying levels of PAHs with lower molecular weight (2-3 rings), with concentrations ranging from 4.9 – 5.2 mg/kg. The levels of 4-ringed, 5- ringed and 6-ringed PAHs ranged from 1.30 to 1.44, 2.14 – 2.47 and 0.20 – 1.53 mg/kg, respectively. The molecular diagnostic ratios of relevant PAH congeners revealed that the ecosystem is contaminated with PAH from multiple (petrogenic and/or pyrogenic) sources. Among the bacterial strains isolated from the sediment samples, Pseudomonas aeruginosa, Bacillus subtilis and Micrococcus luteus were found to possess strong PAHs degrading capabilities. The isolation of bacteria with PAH degradability from the mudflat is an indication that the ecosystems have the capability to recover through natural attenuation over time.

Bacteria degradation PAHs source apportionment.

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