IAEA-CH-7

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synthetic organic polymer (1)

€200.00

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Producing Laboratory: TERC

Availability: In stock

Polyethylene

Unit Size: 3.6 g
Price per Unit: 200 EUR
Report: n.a.
Date of Release: 4/1/1987
Reference Sheet: download (pdf)
Contact point: Analytical-Reference-Materials.Contact-Point@iaea.org

International Chemical Safety Card (ICSC): ICSC_1488

IAEA-CH-7 is a secondary reference material. Its intended use is as calibrant when δ(¹³C) and δ(²H) are determined in organic materials using IRMS (Isotope Ratio Mass Spectrometry) coupled with an EA (Elemental Analyser) and Pyrolizer, for obtaining traceability of the data to the VPDB δ(¹³C) scale and VSMOW-SLAP δ(²H) scale, respectively.

IAEA-CH-7 (formerly PEF-1) was prepared by H. Gerstenberger and M. Herrmann, Zentralinstitut für Isotopen- und Strahlenforschung, Leipzig, Germany [1].

Details about the characterization of IAEA-CH-7 are reported in [2] and [3].

Stable isotope ratio	Reference value	Standard uncertainty with k=1
δ(¹³C)_VPDB-LSVEC (‰)	-32.15	0.05
δ(²H)_VSMOW-SLAP(‰)	-99.2	1.2

Note: For δ(¹³C), currently two scales exist and are in use: VPDB and VPDB-LSVEC. δ(¹³C) values reported on the VPDB and VPDB-LSVEC scale can differ, with maximum reported differences (VPDB minus VPDB-LSVEC) of +0.3 ‰ for materials with carbon isotope delta values around –45 ‰ and negligible difference (below current analytical combined uncertainty) at carbon isotope delta values close to zero [https://doi.org/10.1002/rcm.10018)].

End users should state the values of reference materials used to normalize isotope data following the minimum requirements established by IUPAC [https://doi.org/10.1515/pac-2021-1108] and in the case of carbon, whether they are publishing δ(¹³C) values on the VPDB scale or the VPDB-LSVEC scale. Users should ensure that in one calibration they only use values for reference materials assigned on one scale. 

References:

GERSTENBERGER, H., HERRMANN, M., Report on the intercomparison for the isotope standards Limestone KH2 and Polyethylene Foil PEF 1, ZfI-Mitteilungen 66 (1983) 67-83.
COPLEN, T.B., BRAND, W.A., GEHRE, M., GRÖNING, M., MEIJER, H.A.J., TOMAN, B., VERKOUTEREN, R.M., New guidelines for δ¹³C measurements, Anal. Chem. 78 (2006) 2439-2441.
SCHIMMELMANN, A., QI H., COPLEN, T.B., BRANDT, W.A., FONG, J., MEIER-AUGENSTEIN, W., KEMP, H.F., TOMAN, B., ACKERMANN, A., ASSONOV, S., AERTS-BIJMA, A.T., BREICHA, R., CHIKARAISHI, Y., DARWISH, T., ELSNER, M., GEHRE, M., GEILMANN, H., GROENING, M., HELIE, J.F., HERRERO-MARTIN, S., MEIJER, H.A.J., SAUER, P.E., SESSION A.L., WERNEN R.A. Organic Reference Materials for Hydrogen, Carbon, and Nitrogen Stable Isotope-Ratio Measurements: Caffeines, n‑Alkanes, Fatty Acid Methyl Esters, Glycines, L‑Valines, Polyethylenes, and Oils. Anal. Chem. 88 (2016) 4294−4302

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