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| Titel |
Measurement of Isoprene Nitrates by GCMS |
| VerfasserIn |
Graham Mills, Glyn Hiatt-Gipson, Sean Bew, Claire Reeves |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250129742
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| Publikation (Nr.) |
 EGU/EGU2016-9895.pdf |
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| Zusammenfassung |
| We have, for the first time, synthesised and identified the majority of the primary isoprene
nitrates (INs), formed by reaction of isoprene with the hydroxyl radical (OH) and
nitrate radical (NO3) as described in the Master Chemical Mechanism (MCM). An
instrument based on gas chromatography/mass spectrometry (GCMS) and the associated
calibration methods is described for the speciated measurements of individual isoprene
nitrate isomers. Seven of the primary isoprene nitrates formed by reaction of the OH
with isoprene in the MCM and three primary isoprene nitrates from the reaction of
the NO3 and isoprene are identified, including six newly synthesised INs. Simple
photochemistry bag experiments were performed to demonstrate the capability
to measure speciated INs in complex mixtures. Interestingly, the results showed
isomeric distributions of INs that were quite different to those predicted by model
calculations in earlier studies. In addition, we observed INs that we would expect
from NO3 addition to isoprene despite the bag experiments being carried out in
daylight conditions when we would expect OH to be the only isoprene oxidant. |
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