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Moisture significantly impacts the isotopic stability of pure gases and gas mixtures. However, proper cylinder preparation and pressure regulation ensure consistent isotopic values for carbon dioxide (CO2) over time.

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Area of Science:

  • Analytical Chemistry
  • Geochemistry
  • Environmental Science

Background:

  • Stable isotope gas mixtures are vital for healthcare, geochemistry, and environmental monitoring.
  • Moisture is a critical impurity affecting the stability of compressed gases and gas mixtures.
  • Understanding moisture's impact on isotopic composition is crucial for accurate scientific applications.

Purpose of the Study:

  • To evaluate the effect of moisture on the isotopic stability of gaseous carbon dioxide (CO2).
  • To assess the long-term stability and pressure regulation of CO2 isotopic composition.
  • To demonstrate the viability of using pressurized gases as stable reference standards.

Main Methods:

  • Gaseous carbon dioxide (CO2) was used as a proxy to study isotopic stability.
  • Enriched 18O-water was added to natural-abundance CO2 to accentuate moisture's effects.
  • Cylinder preparation, source material purity, and pressure regulation were optimized to minimize moisture.

Main Results:

  • The addition of enriched 18O-water caused significant shifts in δ18O-CO2 values.
  • Optimized conditions maintained consistent δ13C and δ18O within ±0.04‰ and ±0.06‰, respectively.
  • Consistent isotopic values were observed across the entire cylinder contents and during a 1-year shelf-life study.

Conclusions:

  • Appropriate cylinder preparation and pressure regulation are essential for maintaining the isotopic stability of CO2.
  • Pressurized gases, when properly handled, can serve as reliable working reference standards.
  • This study highlights methods to ensure the integrity of isotopic gas standards for various scientific applications.