How Well Do We Know VPDB-Part 2: Interlaboratory Assessment of Existing δ¹³C_VPDB Reference Materials.

ABSTRACT:

Rationale

In January 2024, the IAEA experts meeting endorsed both δ¹³C scales that are currently used within the scientific community: the Vienna Peedee belemnite (VPDB) δ¹³C scale defined by NBS 19 with a value of +1.95‰ exactly, and the VPDB-LSVEC scale defined by NBS 19 and the lithium carbonate LSVEC with a value of -46.60‰ exactly. Following the discovery of the instability of the LSVEC material, several expert laboratories independently proposed replacement reference materials (RMs). This study compares these calcium carbonate RMs IAEA-610, -611, -612, and USGS44 at the highest level of the metrological traceability chain and recommends values that enable users to realize the VPDB and VPDB-LSVEC scales.

Methods

The phosphoric acid reaction that is

SUBMITTER: Moossen H 

PROVIDER: S-EPMC12676516 | biostudies-literature | 2026 Feb

REPOSITORIES: biostudies-literature