Measurement of isoprene nitrates by GCMS

Mills, Graham P., Hiatt-Gipson, Glyn D., Bew, Sean P. and Reeves, Claire E. (2016) Measurement of isoprene nitrates by GCMS. Atmospheric Measurement Techniques, 9 (9). pp. 4533-4545. ISSN 1867-1381

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Abstract

According to atmospheric chemistry models, isoprene nitrates play an important role in determining the ozone production efficiency of isoprene; however this is very poorly constrained through observations as isoprene nitrates have not been widely measured. Measurements have been severely restricted largely due to a limited ability to measure individual isoprene nitrate isomers. An instrument based on gas chromatography/mass spectrometry (GCMS) and the associated calibration methods are described for the speciated measurements of individual isoprene nitrate isomers. Five of the primary isoprene nitrates which formed in the presence of NOx by reaction of isoprene with the hydroxyl radical (OH) in the Master Chemical Mechanism are identified using known isomers on two column phases and are fully separated on the Rtx-200 column. Three primary isoprene nitrates from the reaction of isoprene with the nitrate radical (NO3) are identified after synthesis from the already identified analogous hydroxy nitrate. A Tenax adsorbent-based trapping system allows the analysis of the majority of the known hydroxy and carbonyl primary isoprene nitrates, although not the (1,2)-IN isomer, under field-like levels of humidity and showed no impact from typical ambient concentrations of NOx and ozone.

Item Type: Article
Additional Information: © Author(s) 2016. This work is distributed under the Creative Commons Attribution 3.0 License.
Faculty \ School: Faculty of Science > School of Environmental Sciences
Faculty of Science > School of Chemistry
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Depositing User: Pure Connector
Date Deposited: 07 Oct 2016 11:00
Last Modified: 28 Oct 2019 15:58
URI: https://ueaeprints.uea.ac.uk/id/eprint/60774
DOI: 10.5194/amt-9-4533-2016

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