Reference Materials

Hydrogen, Carbon, Nitrogen, and Oxygen Stable Isotope Reference Materials

Since 2000, our laboratory at Indiana University has provided materials for stable isotope analyses for the global research community. We sincerely thank our supporters and would like to hear from you if you have questions or suggestions with regard to existing or potential future reference materials. Feedback from endusers helps us maintaining high quality service.

Available Compounds with δ-Values

You can see descriptions of the reference materials by clicking on the Available Compounds tab in the side navigation.

More information is provided below in the links of available compounds. The first webpage is comprehensive in alphabetical order, whereas the other lists are specific for certain compound classes.

Note: Stable isotope ratios of individual compounds may be subject to slight adjustments over time. For example, the development of new materials routinely employs repeat measurements of older materials together with calibrations using pairs of international standards for anchoring and attenuation of isotopic scales, thus occasionally resulting in amended statistical mean δ-values of older reference materials.

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