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
References:
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).
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.
