Isotopically Characterized Gases

Pioneering Innovation with enhanced reliability

Isotopically Characterized Gases

Pioneering Innovation with enhanced reliability

Stable isotope ratio calibrated gases, enhance reliability of analysis with precise calibration to measure critical delta values accurately. Air Liquide offers isotopically characterized gases with high analytical accuracy, required compositions, and targeted isotopic signatures.

Air Liquide stable isotope ratio calibrated gases are categorized into two groups: standard products and custom products.
  • Standard products are “ready to be shipped”.
  • Custom products with customer specific molecular (from ppm to %) and isotopic composition that can be designed upon request.
If a specific gaseous calibration material with an isotopic ratio is required, Air Liquide is here to satisfy your unique requirements. Together we find the best possible solution for your business.

Your benefits

Earth Science & Environment

Isotopic signatures for comprehensive understanding of pollution sources
Research of isotopic signatures (or isotopic fingerprints) is continuing to increase in various areas, including environmental studies. Isotopic signatures have become useful tools for a more comprehensive understanding of pollution sources. To aid in this essential research, Air Liquide has developed a range of reliable reference gases for isotope ratio measurements of Natural Air (with or without CO2) in standard packaging with Stable Isotope delta ratios of C, O, H, N and S elements.

Food authentication

Isotopic analysis to track the origin of Food

Food and beverage adulteration is becoming more common and affects a wide range of products. To safeguard food and beverage production, the global scientific community developed enhanced analytical methods to guard against falsification; isotopic analysis is one of these methods. Isotopic analysis is primarily used in the food and beverage area to detect adulteration and to control the origins of ingredients.

Thanks to this method a wide range of food products such as wine, olive oil, fruit juices, vanilla, honey and spirits can be tested for the presence of adulteration. Air Liquide offers isotopically characterized gases with high analytical accuracy, required compositions and targeted isotope signatures that Improves the reliability of your isotopic analysis.

Petroleum Geochemistry

Isotopic analysis to support accurate exploration and production development planning.
Gas stable isotopes are used to help understand the mechanisms of formation and compositional evolution of gas accumulations on a geologic and production time scale used for petroleum system modeling and reservoir management. Isotopic analysis maximizes information derived from each well, reservoir or field and assists in accurate exploration and production development planning. Air Liquide has developed a unique standard product range of multi-component, natural gas calibration mixtures up to C5 species with specific delta 13C and delta 2H ratios.

Medical Diagnostics

Stable Isotopes to support Breath Testing for fast, accurate and noninvasive testing of diseases
Breath testing is a growing application for fast, accurate and noninvasive testing of various diseases. Breath analyses based on Stable Isotope ratio of key molecules are being researched for non-invasive disease diagnosis and monitoring. Whether you are a clinical laboratory, testing laboratory or an OEM, Air Liquide provides a range of mixtures for equipment qualification, in order to obtain more accurate diagnostics.

Isotopically Characterized Gases based on Instrument Manufacturer specifications

Air Liquide offers a range of standard gases and equipment that is specified by instrument manufacturers for use in isotope ratio analysis applications

Proficiency Testing Programs

Assessment of Accuracy through comparison

Air Liquide provides a unique opportunity to assess the accuracy of your own measurement through comparison with other participating laboratories.

    • High degree of confidence of your laboratory analysis
    • Identification of potential problems in the accuracy of analysis


  • Your benefits:

    • Improves credibility of your analytical laboratory capabilities
    • Identifies potential analytical problems
    • Provides quality comparison of participants
    • Proficiency reference gas mixture can be retained as high-confident master calibration standard

    Air Liquide has a wide range of cylinders sizes available for global use, high pressure (returnable) and disposable cylinders (from 34 L to 4000 L) and pressure regulators to match your application.

Technical Notes & Articles

δ13C of CO2: cylinder preparation and calibration

Interlaboratory comparison of isotopically characterized gases

Enhanced Stability of Stable Isotopic Gases

Scientific Posters

Calibration Mixtures for Improving Accuracy of Stable Isotope Measurements

13C and 18O Isotope Effects Resulting from High Pressure Regulation​ and CO2 Cylinder Depletion

Stability Study of Stable Isotopic Composition of Hydrocarbon gases

Enhanced Stability of Isotopic Gas Mixtures in Non-refillable Cylinders

Air Liquide Expertise Center

High purity gases, mixtures and related equipment for Research & Analysis