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Quantification of the Dissolved Inorganic Carbon Species and of the pH of Alkaline Solutions Exposed to CO 2 under Pressure: A Novel Approach by Raman Scattering

Abstract :

Dissolved inorganic carbon (DIC) content of aqueous systems is a key function of the pH, of the total alkanility (TA), and of the partial pressure of CO2. However, common analytical techniques used to determine the DIC content in water are unable to operate under high CO2 pressure. Here, we propose to use Raman spectroscopy as a novel alternative to discriminate and quantitatively monitor the three dissolved inorganic carbon species CO2(aq), HCO3–, and CO32– of alkaline solutions under high CO2 pressure (from P = 0 to 250 bar at T = 40 °C). In addition, we demonstrate that the pH values can be extracted from the molalities of CO2(aq) and HCO3–. The results are in very good agreement with those obtained from direct spectrophotometric measurements using colored indicators. This novel method presents the great advantage over high pressure conventional techniques of not using breakable electrodes or reference additives and appears of great interest especially in marine biogeochemistry, in carbon capture and storage and in material engineering under high CO2 pressure.

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Article dans une revue
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https://hal.univ-angers.fr/hal-03173095
Contributeur : Okina Université d'Angers <>
Soumis le : jeudi 18 mars 2021 - 11:32:05
Dernière modification le : mardi 31 août 2021 - 11:20:16

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Thomas Beuvier, Brice Calvignac, Jean-François Bardeau, Alain Bulou, Frank Boury, et al.. Quantification of the Dissolved Inorganic Carbon Species and of the pH of Alkaline Solutions Exposed to CO 2 under Pressure: A Novel Approach by Raman Scattering. Analytical Chemistry, American Chemical Society, 2014, 86 (19), pp.9895-9900. ⟨10.1021/ac5025446⟩. ⟨hal-03173095⟩

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