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- W4384694600 abstract "RATIONALE : SLAP is one of the two calibration materials for the isotopic water scale. By consensus the established δ O value is -55.5‰, although there are firm indications that δ O is significantly more negative. The real δ O value as such does not influence the isotopic water scale, however knowledge of the size of isotopic scale contraction in stable isotope measurements is vital for second order isotopes. In this study quantification of δ O with respect to δ O is described. METHODS: SLAP-like water was quantitatively mixed with highly O enriched water to mimic VSMOW. The O concentration was determined using an electron ionization quadrupole mass spectrometer. The isotopic composition of the SLAP-like and VSMOW-like waters were measured with an optical spectrometer, alongside real VSMOW and SLAP. RESULTS: This study resulted in a much more depleted δ O value for SLAP than expected. The averaged outcome of 7 independent experiments is δ O -56.33 ± 0.03‰. There is a large discrepancy between the actual isotopic measurements of even the most carefully operating groups and the true δ O value. CONCLUSIONS: Although this finding as such does not influence the use of the VSMOW-SLAP scale, it raises the intriguing question 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 δ O from and to the VPDB scale, various fractionation factors, and the Δ O. The absolute O abundance for SLAP was determined at 1.88798 (43) x 10 based on the absolute O abundance of VSMOW and the presented δ O in this paper." @default.
- W4384694600 created "2023-07-20" @default.
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- W4384694600 date "2023-07-18" @default.
- W4384694600 modified "2023-09-25" @default.
- W4384694600 title "The absolute δ 18 O value for SLAP with respect to VSMOW reveals a much lower value." @default.
- W4384694600 doi "https://doi.org/10.22541/au.168969268.86420289/v1" @default.
- W4384694600 hasPublicationYear "2023" @default.
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