Distributions and sources of polycyclic aromatic hydrocarbons in surface sediments from the Cross River estuary,S.E. Niger Delta,Nigeria |
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| Authors: | Bassey Offiong Ekpo Orok E Oyo-Ita Daniel R Oros Bernd R T Simoneit |
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| Institution: | (1) Key Laboratory of Marine Sedimentology and Environmental Geology, First Institute of Oceanography, State Oceanic Administration, Qingdao, 266061, China;(2) Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China |
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| Abstract: | Polycyclic aromatic hydrocarbon (PAH) analyses of surface sediments from the Cross River estuary by gas chromatography–mass
spectrometry indicated natural diagenetically derived PAHs in the upper estuary, with minor and variable amounts of petrogenic
and combustion-derived PAHs from human activities (lower estuary). The occurrence of significant amounts of perylene (average
23% of all PAHs) with the diagenetic natural PAHs in the middle estuary bordered by mangrove forests supports its origin from
terrestrial organic matter. The natural PAHs represent the highest percentage (average 76%) of the total PAHs in this tropical
environment. The traditional geochemical parameters, including the petrogenic PAHs, confirmed trace petroleum contamination
in the estuary. Specific PAH ratios such as Fl/Py and Fl/(Fl+Py) also support this source contribution. |
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