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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union

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Atmos. Meas. Tech., 8, 2301-2313, 2015
https://doi.org/10.5194/amt-8-2301-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
04 Jun 2015
A method for stable carbon isotope ratio and concentration measurements of ambient aromatic hydrocarbons
A. Kornilova1, S. Moukhtar1, M. Saccon1, L. Huang2, W. Zhang2, and J. Rudolph1 1Centre for Atmospheric Chemistry, York University, Toronto, ON, M3J 1P3, Canada
2Environment Canada, Toronto, ON, M3H 5T4, Canada
Abstract. 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.

Citation: Kornilova, A., Moukhtar, S., Saccon, M., Huang, L., Zhang, W., and Rudolph, J.: A method for stable carbon isotope ratio and concentration measurements of ambient aromatic hydrocarbons, Atmos. Meas. Tech., 8, 2301-2313, https://doi.org/10.5194/amt-8-2301-2015, 2015.
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Short summary
A technique for compound specific analysis of stable carbon isotope ratios and concentration of ambient volatile organic compounds (VOC) is presented. It is based on selective VOC sampling onto adsorbent filled cartridges. Examples of measurements conducted 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.
A technique for compound specific analysis of stable carbon isotope ratios and concentration of...
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