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Identification des sources printanières de méthylmercure dans le manteau neigeux arctique

Abstract : The arctic seasonal snowpack is a key medium where chemical reaction of mercury (Hg) species occur. Elemental gaseous mercury can be produced through photochemical reduction of Hg(II) complexes, and Hg(II) species can also be oxydized. Complexation of Hg(II) with organic matter can stabilize Hg(II) species that can be subsequently transferred to water bodies during snowmelt. Hg(II) species can be biotically or abiotically transformed to organo-metallic compounds such as methylmercury (MeHg), although currently there are no measurements to confirm these mechanisms. The main goal of this thesis is to understand the pathways of Hg toxification through the production of bioavailable and methylated Hg species. This question is of utmost importance in order to link the atmospheric deposition pathways of Hg on snowpacks (in the Arctic for instance) and the contamination of food chains.
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Submitted on : Friday, September 19, 2014 - 10:39:41 AM
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Alexandre Renard. Identification des sources printanières de méthylmercure dans le manteau neigeux arctique. Sciences de la Terre. Université de Grenoble, 2013. Français. ⟨NNT : 2013GRENU033⟩. ⟨tel-01065074⟩

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