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Assessment of organic pollutants in coastal sediments, UAE

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Environmental Geology

Abstract

Twenty-five stations were selected along the UAE coastal region to delineate the distribution and to determine the source of total petroleum hydrocarbon (TPH), total organic carbon (TOC), total Kjeldhal nitrogen (TKN), polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs). The concentrations of TPH ranged between 46 and 223 mg/kg and the level of TOC was in the range from 0.044 to 17.8 wt%, while TPAHs occupied the range of 5–102.2 μg/kg. On the other hand, TPCBs showed values between 60 and 205 μg/kg and TKN ranged from 104 to 1,073 mg/kg. The present study shows that the distribution of organic compounds in UAE sediments were within safe limits comparing with previous studies. The present study revealed that TOC can be used as an indicator of oil pollution in heavily oiled sediments. The highest values of TOC, TPH, TPAHs and TPCBs related to the stations covered in fine sand due to adsorption properties and the large surface areas of the grains. The evaporation of low-boiling point compounds from surface layers leads to the enrichment of sediments with a thick residual. Al Sharjah-1 exhibited the highest values of TPH and TOC at Ras Al-Khaima-5, Umm Al-Quwen-1 and Dubai-1, while the highest values of TPAHs were at KhorFakkan-9, the highest value of TPCBs was at Ajman-2, and the highest values of TKN were at KhorFakkan-1, KhorFakkan-6 and Dubai-1.

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Acknowledgments

Authors thank the Central Laboratory Unit (CLU) and Petroleum Geochemistry Laboratory in the United Arab Emirates for the analysis of the samples.

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Authors and Affiliations

  1. Department of Chemistry, Faculty of Science, UAE University, P.O. Box 17551, Al-Ain, UAE

    Mohamed Al Azab

  2. Department of Geology, Faculty of Science, UAE University, P.O. Box 17551, Al-Ain, UAE

    Esam A. Abdel Gawad & M. M. Lotfy

Authors
  1. Esam A. Abdel Gawad
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  2. Mohamed Al Azab
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  3. M. M. Lotfy
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Correspondence to M. M. Lotfy.

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Abdel Gawad, E.A., Al Azab, M. & Lotfy, M.M. Assessment of organic pollutants in coastal sediments, UAE. Environ Geol 54, 1091–1102 (2008). https://doi.org/10.1007/s00254-007-0880-x

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  • DOI: https://doi.org/10.1007/s00254-007-0880-x

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