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Gas chromatographic fingerprinting of crude oil from Idu-Ekpeye oil spillage site in Niger-delta, Nigeria

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Abstract

Samples were collected from an oil polluted site in Niger-delta, Nigeria. Gas chromatographic analyses carried out on the samples revealed an abundance of n-alkanes within the n-C8–n-C23 region. The pristane/phytane ratio of 5.70 obtained for the samples depicted a plant/terrestrial source input and a possible oxic depositional environment. The n-C17/pristane and n-C18/phytane ratios of 2.80 and 2.77, respectively, suggested that the spilled oil was only slightly weathered, as corroborated by the presence of peaks in the aromatic hydrocarbon fingerprints. The polycyclic aromatic hydrocarbon (PAH) fractions showed that the hydrocarbon fractions might have undergone combustion and/or that there was bush burning at the site prior to the oil spill incidence. This is supported by the abundance of high-molecular-weight PAHs which are pyrogenic in nature. High molecular weight PAHs are products of the combustion of petroleum or its products. The phenanthrene/anthracene ratio of 0.95, fluorathene/pyrene ratio of 2.23 and the ∑ (other three to six ringed PAHs)/∑ (five alkylated PAHs) ratio far greater than unity (4.10) also affirm this. On the other hand, the benzo (a) anthracene to chrysene ratio of 0.24 confirms the petrogenic origin of the spilled oil because chrysene which is highly abundant is a fossil PAH.

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Authors and Affiliations

  1. Akwa Ibom State University of Technology, University Town, P. M. B. 1167, Uyo, Akwa Ibom State, Nigeria

    Inimfon A. Udoetok

  2. Department of Industrial and Pure Chemistry, University of Port Harcourt, PMB 5323, Choba, Port Harcourt, Nigeria

    Leo C. Osuji

Authors
  1. Inimfon A. Udoetok
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  2. Leo C. Osuji
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Correspondence to Inimfon A. Udoetok.

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Udoetok, I.A., Osuji, L.C. Gas chromatographic fingerprinting of crude oil from Idu-Ekpeye oil spillage site in Niger-delta, Nigeria. Environ Monit Assess 141, 359–364 (2008). https://doi.org/10.1007/s10661-007-9902-0

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  • DOI: https://doi.org/10.1007/s10661-007-9902-0

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