Revised δ34S Reference Values for IAEA Sulfur Isotope Reference Materials S-2 and S-3

Published

February 7, 2009

Author(s)

Jacqueline L. Mann, Robert D. Vocke Jr., William R. Kelly

Abstract

Revised δ³⁴S reference values with associated expanded uncertainties (95% confidence interval (C.I.)) are presented for he sulfur isotope reference materials IAEA-S-2 (22.62 ±0.16{0/00}). These revised values are determined using two relative-difference measurement techniques, gas source isotope ratio mass spectrometry (GIRMS) and double-spike multi-collector thermal ionization mass spectromety (MC-TIMS). Gas analyses have traditionally been considered the most robust for relative isotopic difference measurements of sulfur. The double-spike MC-TIMS technique provides an independent method for value-assignment validation and produces revised valuesthat are both unbiased and more precise than previous value assignments. Unbiased δ³⁴S values are required to anchor the positive and negative end members of the sulfur delta (δ) scale because they are the basis for reporting both δ³⁴S values and the derived mass-independent {Δ}³³S and {Δ}³⁶S values.

Citation

Rapid Communications in Mass Spectrometry

Volume

23

Pub Type

Journals

Download Paper

Local Download

Keywords

sulfur, reference materials, IAEA-S-2, IAEA-S-3, MCTIMS, mass-independent

Citation

Mann, J. , Vocke, R. and Kelly, W. (2009), Revised δ³⁴S Reference Values for IAEA Sulfur Isotope Reference Materials S-2 and S-3, Rapid Communications in Mass Spectrometry, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=901183 (Accessed October 20, 2025)