NBS-127 , Barium Sulfate- out of stock

Materials with known 34S/ 32 S isotopic composition

  • International Chemical Safety Card (ICSC): ICSC_0827

NBS-127 barium sulfate was prepared by J. R. O'Neil, U.S. Geological Survey, by ion exchange of sulfate in seawater from Monterey Bay, California, USA [1,2]. The isotopic values of the reference material NBS-127 are the results of the statistical evaluation of interlaboratory comparisons.

Analyte Value Unit SD R/I/C
δ18O +9.3 VSMOW 0.4 R
δ34S +20.3# VCDT 0.4 R

(R/I/C) Classification assigned to the property value for analyte (Recommended/Information/Certified)
[#] δ34S value versus CDT


  1. HUT, G., Consultants' group meeting on stable isotope reference samples for geochemical and hydrological investigations, 16-18 Sep. 1985. Report to the Director General, INTERNATIONAL ATOMIC ENERGY AGENCY, Vienna (1987).

  2. HALAS, S., SZARAN, J., Improved thermal decomposition of sulfates to SO2 and mass spectrometric determinations of δ34S of IAEA-SO-5, IAEA-SO-6 and NBS-127 sulfate standards. Rapid Commun. Mass Spectrom. 15 17 (2001) 1618-1620.


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