Abstract
Ambient air commonly contains carbon dioxide at concentrations greater than 400 µmol mol−1 and methane at ~ 2000 nmol mol−1; non-methane hydrocarbons are also widespread in the atmosphere at much lower concentrations. For quantification of various carbon-containing compounds in typical analytical instrument, corresponding number of reference materials are required. Therefore, the development of a method that uses a single reference material applicable to air monitoring is desired. Here, we examined a post-column reaction system combined with a gas chromatograph equipped with a flame ionization detector (FID), which involves oxidation and reduction processes after separation. To determine various carbon-containing gases by post-column reaction gas chromatography with FID (GC-r-FID) using a single reference, it is necessary to confirm a good linearity of the response with carbon concentrations originating from various carbon-containing gases. When mixtures of carbon-containing gases at three different concentrations and the calibration curve of the FID response with the concentration converted into methane were used, a single linear calibration curve (correlation coefficient > 0.9999, 18 points) was obtained over four orders of magnitudes (to ~ 5000 µmol mol−1 as methane). The applicability of GC-r-FID was confirmed by determining carbon-containing gases in air and gas seeped from the seafloor samples. Because the results were comparable to those obtained by conventional GC-FID and GC-thermal conductivity detector, typically GC-r-FID with a single reference gas should be suitable for air monitoring.
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Acknowledgements
We are deeply grateful to Toshio Ogura, the boat captain of the Kuroshio, for his support during the field survey. We thank Takeshi Yoshida at the Chiba Prefectural Environmental Research Center; Mitsuhiro Ishii at the Chiba Prefectural Fisheries Research Center; and the members of the AIST for their cooperation. This work was supported by the Research Laboratory on Environmentally-Conscious Developments and Technologies of the National Institute of Advanced Industrial Science and Technology.
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Kitamaki, Y., Aoki, N., Aoki, S. et al. Application of post-column reaction gas chromatography with a single reference gas for offshore air and gas seeped from the seafloor samples. ANAL. SCI. 39, 619–623 (2023). https://doi.org/10.1007/s44211-023-00279-8
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DOI: https://doi.org/10.1007/s44211-023-00279-8