Microfluidic approach for studying CO2 solubility in water and brine using confocal Raman spectroscopy

[Display omitted] ► New fast microfluidic approach for measuring CO2 solubility in aqueous media. ► In situ measurements in a wide range of pressure and temperature. ► Geological lab on chip. This Letter reports a fast and accurate method to quantify dissolved carbon dioxide in water and salted wate...

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Bibliographic Details
Published in:Chemical physics letters 2012-11, Vol.551, p.139-143
Main Authors: Liu, N., Aymonier, C., Lecoutre, C., Garrabos, Y., Marre, S.
Format: Article
Language:English
Subjects:
Chemical Sciences
Material chemistry
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Summary:[Display omitted] ► New fast microfluidic approach for measuring CO2 solubility in aqueous media. ► In situ measurements in a wide range of pressure and temperature. ► Geological lab on chip. This Letter reports a fast and accurate method to quantify dissolved carbon dioxide in water and salted water (NaCl) using microfluidic systems probed by confocal Raman spectroscopy. The relationship of CO2 solubility and Raman band intensity ratios (the νu of the CO2 Fermi dyad over the water stretching band) can be fit from third order polynomial forms, depending on NaCl concentration. This approach allows for a much faster determination of CO2 solubility measurements in pressurized aqueous media. More generally, by easily managing lithospheric fluids in microdevices, this strategy opens avenues towards true ‘Geological Lab on chip’.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2012.09.007