CIPM MRA COMPARISON REPORTS

PILOT STUDY

CCQM-P233

Absolute lithium isotope ratio in LSVEC

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

Citation L. Flierl et al 2026 CIPM MRA Comparison reports 08021

https://doi.org/10.59161/SBHB7900

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

Lu Yang

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

Jochen Vogl

https://orcid.org/0000-0002-0104-748X Bundesanstalt fÃ¼r Materialforschung und -prÃ¼fung (BAM) Germany

Marcus Oelze

https://orcid.org/0000-0002-3950-6629 Bundesanstalt fÃ¼r Materialforschung und -prÃ¼fung (BAM) Germany

Pranav Seena Prem

https://orcid.org/0009-0002-6294-9564 Bundesanstalt fÃ¼r Materialforschung und -prÃ¼fung (BAM) Germany

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

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

Abstract

Five National Metrology Institutes and Designated Institutes participated in the Pilot Study CCQM-P233 "Absolute lithium isotope ratio in LSVEC". Participants were requested to evaluate the isotope ratio n(⁶Li)/n(⁷Li) in LSVEC dissolved in dilute nitric acid, expressed in mol/mol. An overall good agreement between all submitted results was obtained. Participants were encouraged to use MC-ICP-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.

The results will be the basis for a joint publication presenting a new absolute isotope ratio of LSVEC.

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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