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Caractérisation des propriétés de surface des champignons mycorhiziens à arbuscules (MA) en relation avec l'adsorption du cadmium et du cuivre

Abstract : Arbuscular mycorrhizal fungi (AM) improved plant survival and growth in heavy metal polluted soils. To understand the contribution symbiosis in the fate of metals in soil-plant systems, the physico-chemical and parietal acido-basic properties of the mycelium of different AM fungi were characterized from their chemical functional description and evolution of surface charge. Metallic ion sorption experiment with cadmium and copper, were performed and the complexation verified by infrared spectroscopy. Sorption kinetics and isotherms were studied in a continuous reactor by an ion selective electrode (Cd[exponent 2+]), in order to establish the sorption mechanisms involved. Results showed that the parietal composition and the distribution of the organic acidity on the fungal wall (related to chitin content and abundance of carboxylic sites) play an key role in the fungal wall reactivity and sequestration of metal. They also determine the mechanisms involved such as the formation of internal sphere complex (complexation) or external sphere complex (precipitation) according to the surface charge developed on the fungal wall.
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http://docnum.univ-lorraine.fr/prive/SCD_T_2002_0023_BRIONES_GALLARDO.pdf
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https://hal.univ-lorraine.fr/tel-01746694
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Submitted on : Thursday, March 29, 2018 - 10:42:50 AM
Last modification on : Wednesday, March 24, 2021 - 10:36:02 AM

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  • HAL Id : tel-01746694, version 1

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Roberto Briones-Gallardo. Caractérisation des propriétés de surface des champignons mycorhiziens à arbuscules (MA) en relation avec l'adsorption du cadmium et du cuivre. Sciences de la Terre. Université Henri Poincaré - Nancy 1, 2002. Français. ⟨NNT : 2002NAN10023⟩. ⟨tel-01746694⟩

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