CIPM MRA COMPARISON REPORTS

CCQM-K182

Lithium isotope delta measurements

L. Flierl , O. Rienitz , A. Pramann , A. Roethke , J. Eberhardt , D. Arnold , J. Vogl , M. Oelze , P. Seena Prem , T. Ren ... , P. Song , L. Yang , K.S. Lee , S.W. Heo , Y.G. Kim

Citation L. Flierl et al 2026 CIPM MRA Comparison reports 08020

https://doi.org/10.59161/DLCJ3581

Authors

Lukas Flierl

https://orcid.org/0000-0003-2710-4072 Physikalisch-Technische Bundesanstalt (PTB) Germany

Olaf Rienitz

https://orcid.org/0000-0002-5087-5812 Physikalisch-Technische Bundesanstalt (PTB) Germany

Axel Pramann

https://orcid.org/0000-0003-1621-0339 Physikalisch-Technische Bundesanstalt (PTB) Germany

Anita Roethke

https://orcid.org/0000-0002-3963-5287 Physikalisch-Technische Bundesanstalt (PTB) Germany

Janine Eberhardt

https://orcid.org/0000-0002-9287-5933 Physikalisch-Technische Bundesanstalt (PTB) Germany

Dirk Arnold

https://orcid.org/0000-0002-6235-9428 Physikalisch-Technische Bundesanstalt (PTB) Germany

Jochen Vogl

https://orcid.org/0000-0002-0104-748X Bundesanstalt für Materialforschung und -prüfung (BAM) Germany

Marcus Oelze

https://orcid.org/0000-0002-3950-6629 Bundesanstalt für Materialforschung und -prüfung (BAM) Germany

Pranav Seena Prem

https://orcid.org/0009-0002-6294-9564 Bundesanstalt für Materialforschung und -prüfung (BAM) Germany

Tongxiang Ren

https://orcid.org/0000-0002-0813-8990 National Institute of Metrology (NIM) China

Panshu Song

https://orcid.org/0000-0002-7091-9106 National Institute of Metrology (NIM) China

Lu Yang

https://orcid.org/0000-0002-6896-8603 National Research Council (NRC) Canada

Kyoung-Seok Lee

https://orcid.org/0000-0002-4827-1358 Korea Research Institute of Standards and Science (KRISS) Korea, Republic of

Sung Woo Heo

https://orcid.org/0000-0002-7988-8828 Korea Research Institute of Standards and Science (KRISS) Korea, Republic of

Young-Gwang Kim

https://orcid.org/0000-0001-8042-373X Korea Research Institute of Standards and Science (KRISS) Korea, Republic of

Abstract

Five national metrology institutes and designated institutes participated in the key comparison CCQM-K182 "Lithium isotope delta measurements". Participants were requested to evaluate the δLSVEC ⁷Li, expressed in ‰, of two different Li₂CO₃ samples dissolved in dilute nitric acid. Due to the overall good agreement between the reported results for both measurands the arithmetic mean was selected as the key comparison reference value. Participants were encouraged to use MCICP- MS or the most accurate method available. Moreover, participants were required to apply appropriate measures to avoid the severe Li memory effect in their mass spectrometers. Successful participation in CCQM-K182 demonstrates measurement capabilities in determining δLSVEC⁷Li,ranging from -17 ‰ to 17 ‰ in dilute nitric acid.

Note that this text is that which appears in Appendix B of the BIPM key comparison database https://www.bipm.org/kcdb/.

The final report has been peer-reviewed and approved for publication by the CCQM, according to the provisions of the CIPM Mutual Recognition Arrangement (CIPM MRA).

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