Materials with known ³⁴S/³²S isotopic composition

NBS-127, Barium Sulphate

Unit Size: 0.5 g
Price per Unit: 130 €
Report: IAEA-TECDOC-825
Date of Release: 1995

NBS-127 barium sulphate was prepared by J. R. O'Neil, U.S. Geological Survey, by ion exchange of sulphate 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 inter-comparison exercises.

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:

1. Hut, G., Consultants' group meeting on stable isotope reference samples for geochemical and hydrological investigations, Report to the Director General, International Atomic Energy Agency, Vienna, April 1987.
2. Halas S., J. Szaran (2001): 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, 1618-1620.