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| Titel |
Incorporating the VSMOW and VPDB isotope scale into CH4 to produce isotope reference gases for CH4 in air |
| VerfasserIn |
Peter Sperlich, Jürgen M. Richter, Willi A. Brand |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250074355
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| Zusammenfassung |
| Measurement accuracy offsets between laboratories and scale contraction effects are
technical pitfalls that must be identified and corrected for when isotope data of atmospheric
CH4 that were measured by multiple laboratories are merged for analysis. Measurement
agreement can generally be assured by referencing the measurements to certified standard
material. Unfortunately, international isotope reference material for CH4 does not exist,
which challenges the compatibility prerequisite between laboratories measuring isotope ratios
of CH4 in atmospheric samples.
We are developing two methods to incorporate the hydrogen of VSMOW and the carbon of
VPDB isotope scale material into CH4, so the CH4 is then itself representing the VSMOW
and VPDB isotope reference scales for δ2H-CH4 and δ13C-CH4, respectively. This isotope
scale holding CH4 is then diluted with CH4-free air to be used as an atmospheric isotope
reference gas. We present our approach to produce isotope reference gas for δ2H-CH4 and
show our first results. |
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