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Mar Pollut Bull. 2017 Jul 15;120(1-2):340-346. doi: 10.1016/j.marpolbul.2017.05.055. Epub 2017 May 24.

Levels and sources of heavy metals and PAHs in sediment of Djibouti-city (Republic of Djibouti).

Author information

1
Institut des Sciences de la Terre, Centre d'Etude et de Recherche de Djibouti, Route de l'aéroport BP 486, Djibouti, Republic of Djibouti. Electronic address: moussa.mahdi@chemist.com.
2
Laboratoire de Chimie de l'environnement, Equipe Micropolluants Organique, FRE-CNRS 3416, Europôle de l'Arbois-Bátiment Villemin BP 80, Aix en Provence Cedex 4, France.
3
Institut des Sciences de la Terre, Centre d'Etude et de Recherche de Djibouti, Route de l'aéroport BP 486, Djibouti, Republic of Djibouti.
4
Center for Maritime Bioscience Studies-Institute for Research and Community Service, Jenderal Soedirman University, Jl, Dr, Suparno, Purwokerto 53123, Indonesia; Marine Science and Fisheries Faculty, Raja Ali Haji Maritime University, Jl. Politeknik Senggarang-Tanjungpinang, Riau Islands Province, 29100, Indonesia.
5
UMR HydroSciences 5569, Montpellier Université, 15 Avenue Ch, Flahault, 34093 Montpellier Cedex 5, France.

Abstract

Selected heavy metals and polycyclic aromatic hydrocarbons (PAHs) were determined in marine sediment from 28 sites Djibouti city. The concentrations of trace elements varied from 0 to 288.1mg/kg with relative abundance of trace metals in sediments was in the order of Zn>Cu>Ni>Cr>Co>Pb>Cd. Zn, Cu and Ni exceeded consensus based sediment quality guideline values 7, 14, 15 sites respectively. Enrichment factor and pollution load index showed relatively low to moderate contamination. The concentrations of total 16 PAHs varied widely depending on the sample location and ranged from 2.65 to 3760.11ng·g-1, with the mean concentration value of 387.87ng·g-1. Compositions and relative abundance of individual PAH using molecular diagnostic ratio using congener's m/z 178 and 202 indicated pyrolytic origin and reflecting a petroleum combustion, grass/wood and coal combustion and a petrogenic source. This study represents the first pollution baseline and a reference for future studies in Djibouti.

KEYWORDS:

Diagnostic ratio; Enrichment factor; Heavy metals; Marine sediments; PAH's; Red sea

PMID:
28550950
DOI:
10.1016/j.marpolbul.2017.05.055
[Indexed for MEDLINE]

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