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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics


  • Editor: Gregory W. Faris
  • Vol. 5, Iss. 11 — Aug. 25, 2010

Qualitative and Quantitative Analysis of CO2 and CH4 Dissolved in Water and Seawater Using Laser Raman Spectroscopy

Sheri N. White

Applied Spectroscopy, Vol. 64, Issue 7, pp. 819-827 (2010)

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Laboratory experiments have been performed using laser Raman spectroscopy to analyze carbon dioxide (CO2) and methane (CH4) dissolved in water and seawater. Dissolved CO2 is characterized by bands at ∼1275 and 1382 Δcm−1. Dissolved CH4 is characterized by a dominant band at ∼2911 Δcm−1. The laboratory instrumentation used for this work is equivalent to the sea-going Raman instrument, DORISS (Deep Ocean Raman In Situ Spectrometer). Limits of quantification and calibration curves were determined for each species. The limits of quantification are ∼10 mM for CO2 and ∼4 mM for CH4. A ratio technique is used to obtain quantitative information from Raman spectra: the gas bands are referenced to the O–H stretching band of water. The calibration curves relating band height ratios to gas concentration are linear and valid for a range of temperatures, pressures, and salinities. Current instrumentation is capable of measuring the highest dissolved gas concentration observed in end-member hydrothermal fluids. Further development work is needed to improve sensitivity and optimize operational configurations.

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Vol. 5, Iss. 11 Virtual Journal for Biomedical Optics

Sheri N. White, "Qualitative and Quantitative Analysis of CO2 and CH4 Dissolved in Water and Seawater Using Laser Raman Spectroscopy," Appl. Spectrosc. 64, 819-827 (2010)

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