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Development and evaluation of a suite of isotope reference gases for methane in air

Sperlich, P., Uitslag, N. A. M., Richter, J. M., Rothe, M., Geilmann, H., van der Veen, C., Rockmann, T., Blunier, T. & Brand, W. A., 12-Aug-2016, In : Atmospheric Measurement Techniques. 9, 8, p. 3717-3737 21 p.

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  • Peter Sperlich
  • Nelly A. M. Uitslag
  • Juergen M. Richter
  • Michael Rothe
  • Heike Geilmann
  • Carina van der Veen
  • Thomas Rockmann
  • Thomas Blunier
  • Willi A. Brand

Measurements from multiple laboratories have to be related to unifying and traceable reference material in order to be comparable. However, such fundamental reference materials are not available for isotope ratios in atmospheric methane, which led to misinterpretations of combined data sets in the past. We developed a method to produce a suite of synthetic CH4-in-air standard gases that can be used to unify methane isotope ratio measurements of laboratories in the atmospheric monitoring community. Therefore, we calibrated a suite of pure methane gases of different methanogenic origin against international referencing materials that define the VSMOW (Vienna Standard Mean Ocean Water) and VPDB (Vienna Pee Dee Belemnite) isotope scales. The isotope ratios of our pure methane gases range between -320 and +40% for delta H-2-CH4 and between -70 and -40% for delta C-13-CH4, enveloping the isotope ratios of tropospheric methane (about -85 and -47% for delta H-2-CH4 and delta C-13-CH4 respectively). Estimated uncertainties, including the full traceability chain, are

Original languageEnglish
Pages (from-to)3717-3737
Number of pages21
JournalAtmospheric Measurement Techniques
Volume9
Issue number8
Publication statusPublished - 12-Aug-2016

    Keywords

  • RATIO MASS-SPECTROMETRY, HIGH-PRECISION DELTA-C-13, ICE CORE SAMPLES, ATMOSPHERIC METHANE, HYDROGEN ISOTOPES, FIRN AIR, CARBON, SCALE, CH4, DELTA-O-18

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