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Determination of carbon isotope ratios of methanol and acetaldehyde in air samples by gas chromatography-isotope ratio mass spectrometry combined with headspace solid-phase microextraction |
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| Authors: | Keita Yamada Ryota Hattori Yuji Ito Hiroki Shibata Naohiro Yoshida |
| Affiliation: | 1. Department of Environmental Chemistry and Engineering, Interdisciplinary Graduate School of Science and Engineering , Tokyo Institute of Technology , Yokohama, Japan yamada.k.ag@m.titech.ac.jp;3. Central Laboratories for Frontier Technology , Center for Food Safety Science, Kirin Holdings Company Limited , Takasaki Gunma, Japan;4. Department of Environmental Science and Technology, Interdisciplinary Graduate School of Science and Engineering , Tokyo Institute of Technology , Yokohama, Japan;5. Department of Environmental Chemistry and Engineering, Interdisciplinary Graduate School of Science and Engineering , Tokyo Institute of Technology , Yokohama, Japan;6. Department of Environmental Science and Technology, Interdisciplinary Graduate School of Science and Engineering , Tokyo Institute of Technology , Yokohama, Japan |
| Abstract: | Isotopic signatures of atmospheric methanol and acetaldehyde have the potential to improve our ability to quantitatively assess their importance in atmospheric chemistry. However, isotopic measurements of atmospheric methanol and acetaldehyde and their individual source and sink processes have been limited. In this study, we examined gas chromatography-isotope ratio mass spectrometry combined with headspace solid-phase microextraction to measure the carbon isotope ratios of methanol and acetaldehyde in air samples. The method enabled us to determine carbon isotope ratios with a precision (1 standard deviation) of±0.6 ‰ for 20 ml of air sample containing more than 3 ppm of methanol and±0.7 ‰ for 20 ml of air sample containing more than 2 ppm of acetaldehyde. Moreover, the applicability of this method to determine isotope ratios of methanol and acetaldehyde emitted from detached plant leaves was demonstrated. |
| Keywords: | air acetaldehyde carbon-13 ethanol gas chromatography-isotope ratio mass spectrometry (GC–IRMS) headspace solid-phase microextraction (HS-SPME) isotope measurements leaves methanol natural isotope variations |