Metrology for stable isotope reference materials: ¹³C/¹²C and ¹⁸O/¹⁶O isotope ratio value assignment of pure carbon dioxide gas samples on the Vienna PeeDee Belemnite-CO₂ scale using dual-inlet mass spectrometry.

ABSTRACT: Isotope ratio measurements have been conducted on a series of isotopically distinct pure CO₂ gas samples using the technique of dual-inlet isotope ratio mass spectrometry (DI-IRMS). The influence of instrumental parameters, data normalization schemes on the metrological traceability and uncertainty of the sample isotope composition have been characterized. Traceability to the Vienna PeeDee Belemnite(VPDB)-CO₂ scale was realized using the pure CO₂ isotope reference materials(IRMs) 8562, 8563, and 8564. The uncertainty analyses include contributions associated with the values of iRMs and the repeatability and reproducibility of our measurements. Our DI-IRMS measurement system is demonstrated to have high long-term stability, approaching a precision of 0.001 p

SUBMITTER: Srivastava A 

PROVIDER: S-EPMC6082370 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature