CO2 concentration measurements on air samples by mass spectrometry

Leuenberger, M.; Nyfeler, P.; Moret, H. P.; Sturm, P.; Indermühle, A.; Schwander, J. (2000). CO2 concentration measurements on air samples by mass spectrometry. Rapid communications in mass spectrometry, 14(16), pp. 1552-1557. Wiley 10.1002/1097-0231(20000830)14:16%3C1552::AID-RCM63%3E3.0.CO;2-C

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A new technique for measuring CO2 concentration in air samples, based on mass spectrometry, is described as an alternative to the common gas chromatographic method. Using a dual inlet isotope ratio mass spectrometer (IRMS), the ratio of the abundances of the m/z peaks 44 and 28 is determined. The precision of measurements (standard deviation <3 ppmv) is generally as good as the analysis with gas chromatography for small air samples (<1 ml STP of air). A major advantage of this new method is the possibility of parallel elemental and isotopic measurements of many air components. The technique is further improved by new wide mass range mass spectrometers allowing simultaneous intensity measurements of several m/z values between 28 and 44, resulting in an uncertainty of <0.5 ppm. The precision is somewhat limited by the production of N2O and NO2 from N2 and O2 in the ion source, which accounts for about half of the signal strength at m/z 44.

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