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Team TFS
Team TFS
1) Natural Resources Canada, Earth Sciences Sector, 490, de la Couronne, Québec (QC), Canada, G1K 9A9, 2) Environment Canada, Air Quality Research Division, 4905 Dufferin Street, Toronto (ON), Canada, M3H 5T4
Rapid Communications in Mass Spectrometry (2012), V26, pp2791–2804, doi: 10.1002/rcm.6406
Nitrogen and triple oxygen isotopes in near-road air samples using chemical conversion and thermal decomposition
Anna Smirnoff (1), Martine M. Savard (1), Robert Vet (2) and Marie-Christine Simard (1)
The determination of triple oxygen (d18O and d17O) and nitrogen isotopes (d15N) is important when investigating the sources and atmospheric paths of nitrate and nitrite. To fully understand the atmospheric contribution into the terrestrial nitrogen cycle, it is crucial to determine the d15N values of oxidised and reduced nitrogen species in precipitation and dry deposition. In an attempt to further develop non-bioticmethods and avoid expensivemodifications of the gas-equilibration system, we have combined and modified sample preparation procedures and analytical setups used by other researchers. We first chemically converted NO3 – and NH4+ into NO2 – and then into N2O. Subsequently, the resulting gas was decomposed into N2 and O2 and analyzed by isotope ratio mass spectrometry (IRMS) using a pre-concentration system equipped with a gold reduction furnace.
  • IRMS
  • Delta E
  • PreCon
  • 15N and 18O
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