Absolute calibration of the intramolecular site preference of N-15 fractionation in tropospheric N2O by FT-IR spectroscopy

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dc.contributor.authorGriffith, DWTen_AU
dc.contributor.authorParkes, SDen_AU
dc.contributor.authorHaverd, Ven_AU
dc.contributor.authorPaton-Walsh, Cen_AU
dc.contributor.authorWilson, SRen_AU
dc.date.accessioned2009-10-02T05:40:10Zen_AU
dc.date.accessioned2010-04-30T05:04:38Zen_AU
dc.date.available2009-10-02T05:40:10Zen_AU
dc.date.available2010-04-30T05:04:38Zen_AU
dc.date.issued2009-03-15en_AU
dc.date.statistics2009-03-15en_AU
dc.description.abstractNitrous oxide (N2O) plays important roles in atmospheric chemistry both as a greenhouse gas and in stratospheric ozone depletion. Isotopic measurements of N2O have provided an invaluable insight into understanding its atmospheric sources and sinks. The preference for N-15 fractionation between the central and terminal positions (the "site preference") is particularly valuable because it depends principally on the processes involved in N2O production or consumption, rather than the N-15 content of the substrate from which it is formed. Despite the value of measurements of the site preference, there is no internationally recognized standard reference material of accurately known and accepted site preference, and there has been some lack of agreement in published studies aimed at providing such a standard. Previous work has been based on isotope ratio mass spectrometry (IRMS); in this work we provide an absolute calibration for the intramolecular site preference of N-15 fractionation of working standard gases used in our laboratory by a completely independent technique-high-resolution Fourier transform infrared (FT-IR) spectroscopy. By reference to this absolute calibration, we determine the site preference for 25 samples of tropospheric N2O collected under clean air conditions to be 19.8 parts per thousand +/- 2.1 parts per thousand. This result is in agreement with that based on the earlier absolute calibration of Toyoda and Yoshida (Toyoda, S.; Yoshida, N. Anal. Chem. 1999, 71, 4711-4718) who found an average tropospheric site preference of 18.7 parts per thousand +/- 2.2 parts per thousand. We now recommend an interlaboratory exchange of working standard N2O gases as the next step to providing an international reference standard. © 2009, American Chemical Societyen_AU
dc.identifier.citationGriffith, D. W. T., Parkes, S. D., Haverd, V., Paton-Walsh, C., & Wilson, S. R. (2009). Absolute calibration of the intramolecular site preference of N-15 fractionation in tropospheric N2O by FT-IR spectroscopy. Analytical Chemistry, 81(6), 2227-2234. doi:10.1021/ac802371c.en_AU
dc.identifier.govdoc1302en_AU
dc.identifier.issn0003-2700en_AU
dc.identifier.issue6en_AU
dc.identifier.journaltitleAnalytical Chemistryen_AU
dc.identifier.pagination2227-2234en_AU
dc.identifier.urihttp://dx.doi.org/10.1021/ac802371cen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/1914en_AU
dc.identifier.volume81en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectNitrous oxideen_AU
dc.subjectAtmospheric chemistryen_AU
dc.subjectFourier transform spectrometersen_AU
dc.subjectGreenhouse gasesen_AU
dc.subjectCalibrationen_AU
dc.subjectTroposphereen_AU
dc.titleAbsolute calibration of the intramolecular site preference of N-15 fractionation in tropospheric N2O by FT-IR spectroscopyen_AU
dc.typeJournal Articleen_AU
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