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This Reference Material (RM) is a material with known isotope-number ratios for sulfur (S), R( 34S/32S), and oxygen (O), R( 18O/ 16O). It is intended for use in method development, method harmonization and as a control for sulfur isotope-number ratios and oxygen isotope-number ratios of working standards that have been calibrated to the VCDT (Vienna Canon Diablo Troilite) and VSMOW-SLAP (Vienna Standard Mean Ocean Water - Standard Light Antarctic Precipitation) delta-scales. The equivalent name for this RM, as used by the International Atomic Energy Agency (IAEA) and the U.S. Geological Survey (USGS), is NBS127. A unit of RM 8557 (NBS127) consists of one bottle containing approximately 0.5 g of barium sulfate (BaSO4).



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National Institute of Standards and Technology

NIST provides over 1300 Standard Reference Materials® as well as articles and practice guides describing the development, analysis and use of SRMs.

NIST Standard Reference Materials are used by analytical laboratories in industry, academia and government in order to facilitate commerce and trade and to advance research and development. The SRMs are produced by the engineering laboratory, the material measurement laboratory, and the physical measurement laboratory at NIST. They are available for chemical composition, physical properties, and engineering materials.