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| Titel |
Selective-Reagent-Ionization Mass Spectrometry: New Prospects for Atmospheric Research |
| VerfasserIn |
Philipp Sulzer, Alfons Jordan, Eugen Hartungen, Gernot Hanel, Simone Jürschik, Jens Herbig, Lukas Märk, Tilmann D. Märk |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250088447
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| Publikation (Nr.) |
 EGU/EGU2014-2551.pdf |
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| Zusammenfassung |
| Proton-Transfer-Reaction Mass Spectrometry (PTR-MS), which was introduced to the
scientific community in the 1990’s, has quickly evolved into a well-established technology
for atmospheric research and environmental chemistry [1]. Advantages of PTR-MS are i)
high sensitivities of several hundred cps/ppbv, ii) detection limits at or below the pptv level,
iii) direct injection sampling (i.e. no sample preparation), iv) response times in the 100 ms
regime and v) online quantification. However, one drawback is a somehow limited selectivity,
as in case of quadrupole mass filter based instruments only information about nominal m-z
are available. In Time-Of-Flight (TOF) mass analyzer based instruments selectivity is
drastically increased by a high mass resolution of up to 8000 m/Δm, but e.g. isomers still
cannot be separated.
In 2009 we introduced an advanced version of PTR-MS, which permits switching the
reagent ions from H3O+ to NO+ and O2+, respectively [2]. This novel type of
instrumentation was called Selective-Reagent-Ionization Mass Spectrometry (SRI-MS) and
has been successfully used to separate isomers, e.g. the biogenic compounds isoprene
and 2-methyl-3-buten-2-ol as shown by Karl et al. [3]. Switching the reagent ions
dramatically increases selectivity and thus applicability of SRI-MS in atmospheric
research.
Here we report on the latest results utilizing an even more advanced embodiment of
SRI-MS enabling the use of the additional reagent ions Kr+ and Xe+ [4]. With this
technology important atmospheric compounds, such as CO2, CO, CH4, O2, etc. can be
quantified and selectivity is increased even further. We present comparison data between
diesel and gasoline car exhaust gases and quantitative data on indoor air for these compounds,
which are not detectable with classical PTR-MS. Additionally, we show very recent examples
of isomers which cannot be separated with PTR-MS but can clearly be distinguished with
SRI-MS.
Finally, we give an overview of ongoing SRI-MS developments, which include TOF
based instruments with increased sensitivity of one order of magnitude (i.e. in the 103
cps/ppbv regime) by means of using a quadrupole ion guide between the drift tube and the
TOF analyzer. It is expected that these developments will have a serious impact in
atmospheric research, because increased sensitivity implies reduced measurement times and
thus, e.g. even more accurate flux measurements.
References
[1] J. de Gouw, C. Warneke, T. Karl, G. Eerdekens, C. van der Veen, R. Fall, Mass
Spectrometry Reviews, 26 (2007), 223-257.
[2] A. Jordan, S. Haidacher, G. Hanel, E. Hartungen, J. Herbig, L. Märk, R.
Schottkowsky, H. Seehauser, P. Sulzer, T.D. Märk, International Journal of Mass
Spectrometry, 286 (2009), 32 - 38.
[3] T. Karl, A. Hansel, L. Cappellin, L. Kaser, I. Herdlinger-Blatt, W. Jud, Atmospheric
Chemistry and Physics, 12/24 (2012), 11877–11884.
[4] P. Sulzer, A. Edtbauer, E. Hartungen, S. Juerschik, A. Jordan, G. Hanel, S. Feil, S.
Jaksch, L. Märk, T.D. Märk, International Journal of Mass Spectrometry, 321 (2012),
66–70.
Acknowledgement
We acknowledge financial support by the Austrian Research Promotion Agency (FFG),
Wien. |
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