Aquatic hydrocarbon distributions in the Seine estuary: Biogenic polyaromatics and n-alkanes |
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| Authors: | Milena B Fernandes Marie-Alexandrine Sicre Anne Boireau Jacek Tronczynski |
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| Institution: | 1. Laboratoire de Physique et Chimie Marines, Université Pierre et Marie Curie, INSU/CNRS URA 353 4 Place Jussieu, 75252, Paris Cedex 05, France
3. Laboratoire de Chimie des Contaminants et de Modélisation, IFREMER, Centre de Nantes, B.P. 1105, 44311, Nantes Cedex 03, France
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| Abstract: | Dissolved and particulate hydrocarbons of biogenic origin were investigated for the first time in surface waters along the Seine River and its estuary. They comprise n-alkanes (n-ALKs) and diagenetic polycyclic aromatic hydrocarbons (PAHs). Samples were collected in three different sections of the estuary: the riverine zone, the mixing zone, and the marine zone. At the river mouth, two mooring stations were used for the collection of samples over tidal cycles. Total particulate n-ALK concentrations ranged from 31 ng 1?1 to 2,918 ng 1?1, or 5 μg g?1 dry ng 1?1, or 2 μg g?1 of SM. Concentrations varied with the SM load and could be related to sedimentation and estuarine mixing. The sources of the n-ALKs were different in each zone of the estuary. The dissolved n-ALKs displayed lower concentrations than the particulate phase, varying from 136 ng 1?1 to 344 ng 1?1, while biogenic dissolved PAHs were almost absent. |
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