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Comptes Rendus Géoscience
Volume 335, n° 5
pages 435-439 (mai 2003)
Doi : 10.1016/S1631-0713(03)00062-2
Received : 23 October 2002 ;  accepted : 1 April 2003
In situ anaerobic degradation of petroleum alkanes in marine sediments: preliminary results

Delphine  Massias a * ,  Vincent  Grossi b ,  Jean-Claude  Bertrand b
aLaboratoire d'océanographie et de biogéochimie, UMR CNRS 6535, station marine d'Endoume, rue Batterie-des-Lions, 13007 Marseille, France 
bLaboratoire d'océanographie et de biogéochimie, UMR CNRS 6535, faculté des sciences de Luminy, case 901, 13288 Marseille cedex 9, France 

*Corresponding author.
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The degradation of acyclic petroleum hydrocarbons was studied during a 24-month experiment in Mediterranean coastal sediments (Gulf of Fos). Sediment cores entirely contaminated with oil (Arabian Light Crude Oil) were incubated in situ. The use of conservative tracers of sediment's particles reworking (luminophores) allowed the distinction of the reworked layer from the anoxic deeper sediments. Using the  C30 hopane (C30H) as an inert internal reference, we could demonstrate that, after 24 months of experiment, acyclic petroleum hydrocarbons can be degraded under natural anaerobic conditions. The reactivity of individual alkanes appeared to depend on their chemical structure. To cite this article: D. Massias et al., C. R. Geoscience 335 (2003). To cite this article: D. Massias et al., C. R. Geoscience 335 (2003).

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Une expérience conduite dans des sédiments côtiers de Méditerranée (golfe de Fos) a permis d'étudier, pendant 24 mois, la dégradation d'hydrocarbures acycliques. Des carottes sédimentaires, entièrement polluées par du pétrole (brut arabe léger), ont été insérées dans les sédiments naturels et incubées in situ. L'ajout de traceurs du remaniement sédimentaire (luminophores) a permis de distinguer la zone remaniée des couches sous-jacentes anoxiques. L'utilisation du 17 C30 hopane (C30H) comme étalon interne invariant a permis de déterminer qu'en 24 mois, certains hydrocarbures acycliques pétroliers pouvaient être dégradés en anaérobiose. Leur réactivité est toutefois apparue dépendante de leur structure chimique. Pour citer cet article : D. Massias et al., C. R. Geoscience 335 (2003). Pour citer cet article : D. Massias et al., C. R. Geoscience 335 (2003).

Mots clés  : petroleum hydrocarbons ; anaerobic degradation ; in situ experiments ; recent sediment ; bioturbation ; Mediterranean Sea.

Mots clés  : hydrocarbures pétroliers ; dégradation anaérobie ; expériences in situ ; sédiment récent ; bioturbation ; mer Méditerranée.




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