Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group
  • Applied Spectroscopy
  • Vol. 64,
  • Issue 7,
  • pp. 819-827
  • (2010)

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

Not Accessible

Your library or personal account may give you access

Abstract

Laboratory experiments have been performed using laser Raman spectroscopy to analyze carbon dioxide (CO<sub>2</sub>) and methane (CH<sub>4</sub>) dissolved in water and seawater. Dissolved CO<sub>2</sub> is characterized by bands at ∼1275 and 1382 Δcm<sup>−1</sup>. Dissolved CH<sub>4</sub> is characterized by a dominant band at ∼2911 Δcm<sup>−1</sup>. 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 CO<sub>2</sub> and ∼4 mM for CH<sub>4</sub>. 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.

PDF Article
More Like This
Analysis of dissolved C2H2 in transformer oils using laser Raman spectroscopy

Toshihiro Somekawa, Makoto Kasaoka, Fumio Kawachi, Yoshitomo Nagano, Masayuki Fujita, and Yasukazu Izawa
Opt. Lett. 38(7) 1086-1088 (2013)

Highly sensitive Raman system for dissolved gas analysis in water

Dewang Yang, Jinjia Guo, Qingsheng Liu, Zhao Luo, Jingwen Yan, and Ronger Zheng
Appl. Opt. 55(27) 7744-7748 (2016)

Quantitative measurements of CO2 and CH4using a multipass Raman capillary cell

William F. Pearman, J. Chance Carter, S. Michael Angel, and James W-J. Chan
Appl. Opt. 47(25) 4627-4632 (2008)

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Select as filters


Select Topics Cancel
© Copyright 2024 | Optica Publishing Group. All Rights Reserved