Measurement of isoprene nitrates by GCMS
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...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Copernicus Publications
2016-09-01
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| Series: | Atmospheric Measurement Techniques |
| Online Access: | http://www.atmos-meas-tech.net/9/4533/2016/amt-9-4533-2016.pdf |
| _version_ | 1818042514022596608 |
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| author | G. P. Mills G. D. Hiatt-Gipson S. P. Bew C. E. Reeves |
| author_facet | G. P. Mills G. D. Hiatt-Gipson S. P. Bew C. E. Reeves |
| author_sort | G. P. Mills |
| collection | DOAJ |
| description | 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 NO<sub><i>x</i></sub> 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 (NO<sub>3</sub>) 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 NO<sub><i>x</i></sub> and ozone. |
| first_indexed | 2024-12-10T08:47:31Z |
| format | Article |
| id | doaj.art-ad3a720471b3402b89b5209f78dd59e3 |
| institution | Directory Open Access Journal |
| issn | 1867-1381 1867-8548 |
| language | English |
| last_indexed | 2024-12-10T08:47:31Z |
| publishDate | 2016-09-01 |
| publisher | Copernicus Publications |
| record_format | Article |
| series | Atmospheric Measurement Techniques |
| spelling | doaj.art-ad3a720471b3402b89b5209f78dd59e32022-12-22T01:55:41ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482016-09-01994533454510.5194/amt-9-4533-2016Measurement of isoprene nitrates by GCMSG. P. Mills0G. D. Hiatt-Gipson1S. P. Bew2C. E. Reeves3Centre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, UKSchool of Chemistry, University of East Anglia, Norwich, NR4 7TJ, UKSchool of Chemistry, University of East Anglia, Norwich, NR4 7TJ, UKCentre for Ocean and Atmospheric Sciences, School of Environmental Sciences, University of East Anglia, Norwich, NR4 7TJ, UKAccording 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 NO<sub><i>x</i></sub> 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 (NO<sub>3</sub>) 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 NO<sub><i>x</i></sub> and ozone.http://www.atmos-meas-tech.net/9/4533/2016/amt-9-4533-2016.pdf |
| spellingShingle | G. P. Mills G. D. Hiatt-Gipson S. P. Bew C. E. Reeves Measurement of isoprene nitrates by GCMS Atmospheric Measurement Techniques |
| title | Measurement of isoprene nitrates by GCMS |
| title_full | Measurement of isoprene nitrates by GCMS |
| title_fullStr | Measurement of isoprene nitrates by GCMS |
| title_full_unstemmed | Measurement of isoprene nitrates by GCMS |
| title_short | Measurement of isoprene nitrates by GCMS |
| title_sort | measurement of isoprene nitrates by gcms |
| url | http://www.atmos-meas-tech.net/9/4533/2016/amt-9-4533-2016.pdf |
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