The absolute δ < sup > 18 < /sup > O value for SLAP with respect to VSMOW reveals a much lower value than previously established

CONCLUSIONS: Although this finding as such does not influence the use of the VSMOW-SLAP scale, it raises the intriguing question of what we actually measure with our instruments and why even a fully corrected measurement can be so far off. Our result has consequences for issues like the transfer of δ18 O from and to the VPDB scale, various fractionation factors, and Δ17 O. The absolute 18 O abundance for SLAP was calculated as (1887.98 ± 0.43) × 10-6 based on the absolute 18 O abundance of VSMOW and the presented δ18 OSLAP in this paper.PMID:38356090 | DOI:10.1002/rcm.9678

Source: Rapid Communications in Mass Spectrometry : RCM - February 15, 2024 Category: Chemistry Authors: Anita Th Aerts-Bijma Albert C van Buuren Dipayan Paul Harro A J Meijer Source Type: research