Scientific Correspondence | Published:

Sulphur isotope data consistency improved

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Abstract

The standard used for reporting relative sulphur isotope-abundance data has, historically, been troilite (FeS) derived from the Cañon Diablo meteorite, CDT. However, the isotopic inhomogeneity of this material — the variability in its sulphur-34/sulphur-32 isotope ratio is at least 0.4‰ — greatly exceeds the achievable analytical uncertainty of 0.05‰ (ref. 1). Accordingly, the International Union of Pure and Applied Chemistry (IUPAC) has recommended the setting up of a VCDT scale, which is expected to improve agreement between laboratories in measuring this ratio, δ34S.

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References

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    Beaudoin, G., Taylor, B. E., Rumble III, D., & Thiemens, M. Geochim. Cosmochim. Acta 58, 4253–4255 (1994).

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    Reference and Intercomparison Materials for Stable Isotopes of Light Elements (International Atomic Energy Agency, Vienna, TECDOC-825) 7-12 (1995).

  3. 3

    Robinson, B. W. in Reference and Intercomparison Materials for Stable Isotopes of Light Elements (International Atomic Energy Agency, Vienna, TECDOC-825) 39-45 (1995).

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    Krouse, H. R., & Coplen, T. B. Pure Appl. Chem. 69, 293–295 (1997).

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