期刊
ANALYTICAL CHEMISTRY
卷 91, 期 23, 页码 14967-14974出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.9b03412
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资金
- ExxonMobil Research & Engineering/MIT Membership and Research Agreement for Founding Members [EM09079]
- ExxonMobil
We present precise measurements of doubly deuterated methane ((CH2D2)-C-12) in natural methane samples using tunable infrared laser direct absorption spectroscopy (TILDAS). Using a 413 m optical path length astigmatic Herriott cell and two quantum cascade lasers (QCLs) scanning the spectral regions of 1090.46 +/- 0.1 and 1200.23 +/- 0.1 cm(-1), the instrument simultaneously measures the five main isotopologues of methane. The ratios (CH3D)-C-13/(CH4)-C-12 and (CH2D2)-C-12/(CH4)-C-12 are measured at 0.01 parts per thousand and 0.5 parts per thousand (1 sigma) instrumental precision, respectively. The instrumental accuracy was assessed by measuring a series of methane gases with a range of delta C-13 and delta D values but with the abundances of all isotopologues driven to thermal equilibrium at 250 degrees C. The estimated accuracy of Delta(CH2D2)-C-12 is 1 parts per thousand (1 sigma) on the basis of the results of the heated methane samples. This new TILDAS instrument provides a simple and rapid technique to explore the sources of methane in the environment.
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