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Développement d'un microsystème séparatif sur monolithe organique pour l'analyse des radionucléides en milieu acide nitrique

Abstract : Radionuclides analysis is a key point for nuclear waste management and nuclear material control. Several steps of sample modification have to be carried out before measurements in order to avoid any interferences and improve measurement precision. However those different steps are long, irradiant and difficult to achieve in gloveboxes. Moreover they produce liquid and solid waste. The goal of the study is to offer a new alternative to the use of solid phase extraction column for radionuclides separation in hard nitric acid medium. The system will decrease the amount of nuclear waste due to the analysis and automatize the different steps of the analysis. A plastic device made of COC containing a micro solid phase extraction column is first designed. Stationary phase is a poly(AMA-co-EDMA) monolith synthetized in situ. Its structure is adjustable and its functionalization versatile with a high resistance to nitric acid medium. Exchange capacity is 150 mg/g of monolith for TBP and TBP/CMPO column and up to 280 mg/g of monolith in case of DAAP. Exchange coefficients are determined for U(VI), Th(IV), Eu(III) and Nd(III) for 3 different extractants (and Pu(IV) in case of TBP column). Monolith synthesis is transferred in centrifugal device and hydrodynamic behavior studied. U,Th/Eu separation was finally carried out in both classic and centrifugal microsystem on TBP column.
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Submitted on : Friday, May 25, 2018 - 1:02:18 AM
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  • HAL Id : tel-01799641, version 1

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Marion Losno. Développement d'un microsystème séparatif sur monolithe organique pour l'analyse des radionucléides en milieu acide nitrique. Chimie analytique. Université Pierre et Marie Curie - Paris VI, 2017. Français. ⟨NNT : 2017PA066423⟩. ⟨tel-01799641⟩

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