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Biodisponibilité du naphtalène dans des suspensions argileuses

Abstract : The principle aim of this work is to determine the parameters limiting the bioavailability of organic compounds in the environment. For this study, we used naphthalene, a poorly soluble polycyclic aromatic hydrocarbon as model of organic compound. The biodegradation of naphthalene by Burkholderia cepacia was studied in the presence of different clay particles in suspension: Namontmorillonite which does not retain naphthalene (Kp=0mLg-1), two materials with narrow retention capacity, montmorillonite/polyacrylamide complex (Kp=40mLg-1) and a river sediment (Kp=20mLg-1), and an organo-clay which sorbes naphthalene in high quantities (Kp=5920mLg-1). Only a slight and non significant modification of the biodegradation rate of naphtalene are observed in the presence of the complex maybe due to the small concentration of particles (< 0,5gL-1). With the sediment, the quantities of biodegraded naphthtalene and the biodegradation rates are increased, explained by the biodegradable organic carbon and the indigeneous microorganisms canied out by the sediment. However, the presence of 0.5gL-1 montmorillonite (non sorbant) and 0.5gL-1 of B34 (high sorbant) decreases by a factor about 3 the biodegradation rates. Several experimentations show that neither external mass transfer, neither internaI mass transfer are responsible for the reduction of bioavailability of naphthalene. By its high cationic exchange capacity, Na-montmorillonite retain oligoelements, limiting their bioavailability. Naphthalene sorption by organo clay B34 is responsible for the decrease of its concentration in solution, explaining the slower biodegradation kinetics. In conclusion, the modification of the biodegradation kinetics are related to the bioavailability of the compound and also of the bioavailability of other mineral compounds.
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Sandrine Magdaliniuk. Biodisponibilité du naphtalène dans des suspensions argileuses. Chimie. Université Henri Poincaré - Nancy 1, 1995. Français. ⟨NNT : 1995NAN10457⟩. ⟨tel-01747124⟩



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