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Design et optimisation d'une interface fonctionnalisée par des nanoparticules métalliques et des couches organiques électroformées pour la détection de métaux lourds à l'état de traces dans les eaux

Abstract : Mercury is known for its toxicity on human beings, causing neurological and kidney diseases when absorbed in the body. It is rejected in the environment, and especially in surface waters, through natural processes like volcanism and human industrial activities. When present in water, it is ingested by marine plants and wildlife and bioaccumulates all along the food chain. It is then present in high proportions in marine predators, jeopardizing their health and exposing human beings to important mercury quantities in the food supply. The European legislation is very strict regarding to allowed mercury levels in waters, and is based on very low values, from traces to ultra traces. Current techniques able to detect such small doses are efficient but suffer from numerous drawbacks like their cost or the impossibility to use them for in situ measurements. Electrochemical sensors appear to be one of the most interesting alternatives for detection of this heavy metal in aqueous solution. The aim of this work was then to develop an electrochemical sensor based on the functionalization of a glassy carbon electrode with organic layers and gold nanoparticles for mercury detection. Two types of organic layers were used and the interfaces were characterised by using cyclic voltammetry and Scanning Electron Microscopy. Two different gold nanoparticles activation processes were tested. The interfaces performances were evaluated for detection of traces of mercury, as well as their storage stability.
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Submitted on : Friday, November 23, 2018 - 5:03:05 PM
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Emelyne Gervais. Design et optimisation d'une interface fonctionnalisée par des nanoparticules métalliques et des couches organiques électroformées pour la détection de métaux lourds à l'état de traces dans les eaux. Génie des procédés. Université Paul Sabatier - Toulouse III, 2017. Français. ⟨NNT : 2017TOU30258⟩. ⟨tel-01933466⟩

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