The effect of N2O on the isotopic composition of air-CO2 samples

Rapid Communications in Mass Spectrometry : RCM
Prosenjit Ghosh, Willi A Brand

Abstract

The ionisation efficiencies of N2O vs. CO2 as well as their ratios were measured in detail introducing clean N2O and CO2 into the electron impact ion source of an isotope ratio mass spectrometer. Changes in the ionisation efficiency ratio (IER) were found for different electron energy settings and compared with the ratios of literature ionisation cross-section values for pure N2O and CO2. To establish the influence of mixtures of N2O and CO2 in a mass spectrometer, artificial air mixtures were prepared by mixing different amounts of N2O and CO2 from well-calibrated spike cylinders with CO2-free air. The mixing ratios varied from 8-512 ppb for N2O and from 328-744 ppm for CO2. With these mixtures the effects of varying N2O concentrations on apparent CO2 isotope ratios in air samples were determined. After applying a mass balance correction the delta13C results were consistent within small error margins. The data seemed almost independent from a particular choice for the IER of N2O vs. CO2 in the correction algorithm. For delta18O a small effect of the ionisation efficiency ratio of N2O vs. CO2 was found. Several sets of calculations were made varying the IER between 0.88 and 0.62. The dependence of delta18O was the smallest with...Continue Reading

Citations

Nov 9, 2004·Journal of Mass Spectrometry : JMS
May 10, 2005·Rapid Communications in Mass Spectrometry : RCM·D BeheydtO Van Cleemput
Apr 4, 2009·Rapid Communications in Mass Spectrometry : RCM·S AssonovC A M Brenninkmeijer
Feb 18, 2009·Rapid Communications in Mass Spectrometry : RCM·Willi A BrandMichael Rothe
May 6, 2006·Rapid Communications in Mass Spectrometry : RCM·S S Assonov, C A M Brenninkmeijer
Nov 6, 2012·Rapid Communications in Mass Spectrometry : RCM·Eugeni Barkan, Boaz Luz

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