What question did this study set out to answer?

This research aims to compare the effectiveness of FTIR and CRDS in determining the isotopic composition of CO2 in gaseous CRMs.

February 5, 2026

Comparison of cavity ring-down spectroscopy and Fourier transform infrared spectroscopy for the isotopic composition determination of CRMs of CO

Key Points

This research aims to compare the effectiveness of FTIR and CRDS in determining the isotopic composition of CO2 in gaseous CRMs.
Conducted a comparative analysis of FTIR and CRDS techniques at INRiM.
Evaluated isotopic composition based on δ13C measurements of certified reference materials.
Analyzed gaseous mixtures characterized for CO2 at ambient levels.
FTIR and CRDS showed varying effectiveness in assigning isotopic compositions.
Results indicate a range of δ13C-CO2 from +1.3 ‰ VPDB to -42 ‰ VPDB was accurately captured.
FTIR had specific advantages in certain isotopic measurements compared to CRDS.

Abstract

Gaseous Certified Reference Materials (CRMs) characterised for the isotopic composition of carbon dioxide (CO2) in air at ambient amount fraction are crucial for understanding the anthropogenic contribution to climate change. At INRiM, the Italian National Metrology Institute, the realization of gaseous mixtures, which are candidate CRMs of CO2 in air at ambient level and known isotopic composition, is ongoing. Fourier transform infrared spectroscopy (FTIR) and cavity ring-down spectroscopy (CRDS) are used to verify the mixtures for their isotopic composition, in terms of δ13C-CO2 in the range from +1.3 ‰ VPDB to -42 ‰ VPDB. In this work, a comparison between the performances of the two analytical techniques FTIR and CRDS used at INRiM to assign the isotopic composition to the prepared candidate CRMs is presented.

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