Stable Isotope Ratio Reference Gases
Pioneering Innovation with enhanced reliability

Stable isotope ratio reference gases, enhance reliability of analysis with precise calibration to measure critical delta values accurately.

Your benefits

  • Stable isotope ratio reference gases with an isotopic composition customized for each of your products
  • You will rely on Air Liquide reference gases to provide more reliable analysis
  • Time saving : more efficient calibration of equipments used for stable isotopes analysis

Isotopic Analysis

Air Liquide offers stable isotope ratio reference gases with high analytical accuracy, required compositions, and targeted isotopic signatures.

The five most commonly used elements (C, O, H, N, and S) in stable isotope research are currently available with a large range of isotopic ratios. Air Liquide provides stable isotope ratio reference gases in cylinders with sizes adapted to your needs.

Air Liquide stable isotope ratio reference 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 reference 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.


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.

  Please review our products specifications sheet for more details


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 stable isotope ratio reference gases with high analytical accuracy, required compositions and targeted isotope signatures that Improves the reliability of your isotopic analysis.

  Please review our products specifications sheet for more details


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.

  Please review our products specifications sheet for more details


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.

  Please review our products specifications sheet for more details


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.

  Please review our products specifications sheet for more details


Under Development

Stable Isotopic reference materials for Industrial Lighting and Medical applications

Air Liquide is constantly evolving and as a leader in the industry we always strive to create new interesting and efficient offers. Come back and visit us to see what we are up to.

Scientific Posters


Calibration Mixtures for Improving Accuracy of Stable Isotope Measurements

  Download Poster

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

  Download Poster

Stability Study of Stable Isotopic Composition of Hydrocarbon gases

  Download Poster


The benefits are clear


Strong expertise

Our offer is, hands down, the simplest way to buy high quality and reliable analytical gases. By providing you with a straightforward, less time-consuming way to choose analytical gases, we make sure you have more time to be more productive elsewhere.

Easy to reach

We pride ourselves on our customer-centric service. We know that having the right product at the right time and having a commitment to guaranteeing a short and reliable lead time, are key factors. We make sure that you, as an Air Liquide customer, have all the expertise you need from first contact to the delivery of your products.

Reliable service

When it comes to analytical gases, precision makes the difference. Air Liquide offers irrefutable accuracy and traceability, guaranteed by ISO-9001 and ISO 17025 certificates and accreditations. Quality is also guaranteed by strict monitoring of all trace impurities in raw materials. To achieve this, we monitor mixture stability at manufacture and over time.


Contact information

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