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| Titel |
Iodide Chemical Ionization Mass Spectrometry for Trace gas Measurement in Different Environments |
| VerfasserIn |
Philipp Eger, Gavin J. Phillips, John N. Crowley |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250149918
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| Publikation (Nr.) |
 EGU/EGU2017-14321.pdf |
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| Zusammenfassung |
| Chemical Ionization Mass Spectrometry (CIMS) is a versatile and specific technique to
simultaneously measure various atmospheric trace gases with good temporal resolution and
detection limits in the ppt range (Huey et al., 1995). Our Iodide-CIMS with polonium ionizer
and quadrupole mass filter has been used in the past to make measurements of
halogenated and organic nitrates and peracetic acid (Phillips et al., 2012; Phillips
et al., 2013). Here we present a modified I-CIMS instrument with an electrical
discharge ion source that is able to detect a wider variety of gas-phase molecules
including peroxyacyl nitrates (PANs), peracetic acid (PAA), ClNO2, HCl, SO2
and organic acids. We show the results of three different field campaigns that took
place in maritime, mixed urban/rural and forested environment and outline the
instrumental design and the ion chemistry involved. In aged marine air masses
(CYPHEX 2014) we measured elevated levels of HCl, ClNO2 and SO2, whereas in the
boreal forest (IBAIRN 2016) organic acids resulting from biogenic VOC oxidation
were predominant. In mixed urban/rural sites (NOTOMO 2015) both low- and
high-NOx conditions were encountered and SO2, PAN, PAA, HCl and ClNO2 were
observed. |
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