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13CO2/12CO2 isotopic ratio measurements using a difference frequency-based sensor operating at 4.35 micrometers.

M Erdelyi1, D Richter, F K Tittel

  • 1Rice Quantum Institute, Rice University, Houston, TX 77005, USA.

Applied Physics. B, Lasers and Optics
|March 1, 2003
PubMed
Summary
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A new portable gas sensor precisely measures the carbon isotope ratio (¹³C/¹²C) in carbon dioxide (CO2) for volcanic gas studies. This advancement aids in understanding volcanic emissions with high accuracy.

Area of Science:

  • Geochemistry
  • Analytical Chemistry
  • Environmental Science

Background:

  • Volcanic gas emissions are crucial for understanding Earth's carbon cycle and volcanic activity.
  • Accurate measurement of carbon isotopes (¹³C/¹²C) in CO2 provides insights into gas origins and processes.
  • Existing methods for isotopic analysis can be complex and not field-deployable.

Purpose of the Study:

  • To develop a portable, modular gas sensor for in-situ measurement of the ¹³C/¹²C isotopic ratio in CO2.
  • To achieve high precision (0.8% +/-1 sigma) for volcanic gas emission studies.
  • To enable rapid comparison of isotopic ratios between gas samples and reference standards.

Main Methods:

  • Utilized a difference frequency generation (DFG)-based spectroscopic source operating at 4.35 micrometers.
Keywords:
NASA Discipline Life Sciences TechnologiesNon-NASA Center

Related Experiment Videos

  • Employed a dual-chamber gas absorption cell for direct absorption spectroscopy.
  • Focused on minimizing temperature and pressure fluctuations to enhance precision.

    • Main Results:

    • Developed a portable modular gas sensor capable of measuring the ¹³C/¹²C isotopic ratio in CO2.
    • Achieved a precision of 0.8% (+/-1 sigma) for the isotopic ratio measurements.
    • Demonstrated rapid comparisons of isotopic ratios using direct absorption spectroscopy.

    Conclusions:

    • The developed sensor is suitable for field deployment in volcanic gas emission studies.
    • The sensor provides a precise and rapid method for analyzing CO2 isotopic ratios.
    • Minimizing environmental fluctuations is critical for maintaining measurement accuracy.