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Hydrogen Isotopic Reference

 δ2H Values of Hydrogen Isotopic Reference Materials

Description 

NIST RM # 

Material

Nominal Unit Size

δ2HVSMOW

Footnote

Ref

VSMOW 8535 water 20 mL 0 ‰ * 1
SLAP 8537 water 20 mL  –428 ‰ * 1
GISP 8536 water 20 mL  –189.73 ‰   2
NBS 22 8539 oil 1 mL  –117 ‰   31
NBS 30 8538 biotite 2 g  –66 ‰   2
USGS42   human hair (Tibetan) 0.5 g –78.5 ‰   32
USGS43   human hair (Indian) 0.5 g –50.3 ‰   32
NGS1 8559 natural gas (coal origin) < 2 g –138 ‰ (CH4)   3
NGS2 8560 natural gas (petroleum origin) < 2 g –173 ‰  (CH4)   3
NGS2 8560 natural gas (petroleum origin) < 2 g –121 ‰  (C2H6)   3
NGS3 8561 natural gas (biogenic) < 2 g –176 ‰  (CH4)   3
IAEA-CH-7 8540 polyethylene foil  3.6 g  –100 ‰   2

*  Exact values defining the delta scale

Recommendations on the Reporting of δ2H Measurements

At the 37th IUPAC General Assembly in 1993 in Lisbon, the Commission recommended that δ2H values of all hydrogen-bearing materials be measured and expressed relative to VSMOW reference water on a scale normalized by assigning consensus values of –428 ‰ to SLAP reference water, and authors should clearly state so in their reports. Previously, this recommendation applied only to water (ref. 1). 

Authors are encouraged to report their measurement results for δ2H values of NBS 22 oil, IAEA-CH-7 polyethylene foil, or other internationally distributed reference materials, as appropriate for the measurement method concerned, had they been analyzed with the author’s samples. 

Authors should discontinue reporting their δ2H values relative to SMOW. 

The full recommendation appears in:
Reporting of stable hydrogen, carbon, and oxygen isotopic abundances, Coplen, T. B., Pure Appl. Chem., 66, 273-276 (1994).  [full text - pdf 242 KB] {H, C, O Isotopic Rept Guidelines.pdf}

References

1. Gonfiantini, R., Standards for stable isotope measurements in natural compounds, Nature, 271, 534-536 (1978).
2. Gonfiantini, R., Stichler, W., and Rozanski, K., Standards and intercomparison materials distributed by the International Atomic Energy Agency for stable isotope measurements, in Reference and intercomparison materials for stable isotopes of light elements, Vienna, Austria, International Atomic Energy Agency, IAEA-TECDOC-825, 13-29 (1995).
3. Hut, G., Consultants' group meeting on stable isotope reference samples for geochemical and hydrological investigations, Vienna, International Atomic Energy Agency, 42 p (1987).
31. Coplen, T. B., and Qi, H., Applying the silver-tube introduction method for thermal conversion elemental analysis and a new δ2H value for NBS 22 oil, Rapid Comm. Mass Spectrom., 24, 2269-2276 (2010).
32. Coplen, T. B., and Qi, H., USGS42 and USGS43: Human-hair stable hydrogen and oxygen isotopic reference materials and analytical methods for forensic science and implications for published measurement results, Forensic Sci. Int. (2011), doi:10.1016/j.forsciint.2011.07.035

 

 

 
2010 Commission on Isotopic Abundances and Atomic Weights | a commission of the International Union of Pure and Applied Chemistry