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Poster De Conférence Année : 2023

Development of an optical pH probe for monitoring the Cigeo storage site.

Olaitan-Germaine Olorounto
Denis Doizi
  • Fonction : Auteur
Guy Deniau
  • Fonction : Auteur

Résumé

In France, the reversible deep geological repository, which would be located on the border of the Haute-Marne and de la Meuse aims to provide a definitive solution to the problem posed by the most radioactive waste produced mainly by the nuclear industries. This storage center called Cigeo (Industrial Center for geological storage of waste), will be operated over a secular period, it is important to enrich knowledge on the environmental monitoring of this storage center. The objective of the work is to develop a robust optical probe dedicated to the measurement of the pH of the poral water from the clay rock at the alveoli intended to receive packages of nuclear waste. The idea is to develop a robust optical probe to measure pH in situ, online and especially offset measurement. The experimental device of this probe consists of a light source, a spectrometer, a data processing software, a mirror and optical fibers that carry the light information to the detector. According to the principle of this probe, a light source is connected to a multimode emission optical fiber that injects the light into it. The emission fiber carries the light to the place where the measurement is to be made. A mirror, constitutive of the optical chain returns the light in a multimode reception optical fiber to a spectrometer for analysis and then the computer is used to process spectral responses. To achieve this objective, electrografting by reducing the diazonium aryl salts of a coloured pH indicator is carried out either on the metallized optical fiber or on the metal mirror of the optical chain. The efficiency of this chemistry is based on the high reactivity of aryl radicals produced in situ under polarization of the surface of the metal substrate to be functionalized. As a result of grafting, covalent bonds are generated at the interface of the conductive substrate and the organic multilayer formed. For reasons of optimization of experimental parameters and characterization of functionalized surfaces, a glass slide was used to simulate the conductive substrate. After grafting, the glass slide is characterized by various spectrometric methods such as visible UV, ATR Infra-Red, XPS, profilometry.

Domaines

Chimie
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Dates et versions

cea-04327891 , version 1 (06-12-2023)

Identifiants

  • HAL Id : cea-04327891 , version 1

Citer

Olaitan-Germaine Olorounto, Denis Doizi, Guy Deniau. Development of an optical pH probe for monitoring the Cigeo storage site.. Elecnano 10, May 2023, Paris, France. 2023. ⟨cea-04327891⟩
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