Development and evaluation of a suite of isotope reference gases for methane in airSperlich, 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.
Research output: Contribution to journal › Article › Academic › peer-review
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
|Number of pages||21|
|Journal||Atmospheric Measurement Techniques|
|Publication status||Published - 12-Aug-2016|
- RATIO MASS-SPECTROMETRY, HIGH-PRECISION DELTA-C-13, ICE CORE SAMPLES, ATMOSPHERIC METHANE, HYDROGEN ISOTOPES, FIRN AIR, CARBON, SCALE, CH4, DELTA-O-18