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| Titel |
A method for stable carbon isotope ratio and concentration measurements of ambient aromatic hydrocarbons |
| VerfasserIn |
A. Kornilova, S. Moukhtar, M. Saccon, L. Huang, W. Zhang, J. Rudolph |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 8, no. 6 ; Nr. 8, no. 6 (2015-06-04), S.2301-2313 |
| Datensatznummer |
250116422
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| Publikation (Nr.) |
 copernicus.org/amt-8-2301-2015.pdf |
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| Zusammenfassung |
| A technique for compound-specific analysis of stable carbon
isotope ratios and concentration of ambient volatile organic compounds (VOCs)
is presented. It is based on selective VOC sampling onto adsorbent-filled
cartridges by passing large volumes of air (up to 80 L) through the
cartridge. The hydrocarbons are recovered by thermal desorption followed by
two-step cryogenic trapping and then are separated by gas chromatography in
the laboratory. Once separated, individual VOCs are subjected to online
oxidation in a combustion interface and isotope ratio analysis by isotope
ratio mass spectrometry. The method allows measurements of stable carbon
isotope ratios of ambient aromatic VOCs present in low pptV to ppbV levels
with an accuracy of typically better than 0.5 ‰. The
precision of concentration measurements is better than 10%. Examples of
measurements conducted as part of a joint Environment Canada–York University
(EC-YU) measurement campaign at a semi-rural location demonstrate that the
ability to make accurate measurements in air with low VOC mixing ratios is
important to avoid bias from an overrepresentation of samples that are
strongly impacted by recent emissions. |
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