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Issue 23, 2014
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Development and validation of a cryogen-free automatic gas chromatograph system (GC-MS/FID) for online measurements of volatile organic compounds

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Abstract

An automatic gas chromatograph system equipped with a mass spectrometer and a flame ionization detector (GC-MS/FID) was developed for online measurements of volatile organic compounds (VOCs) in the atmosphere. This system consisted of a custom-built cryogen-free cooling device that can create an ultra-low temperature of −165 °C, a two-channel sampling and pre-concentration system, and a commercial GC-MS/FID. One channel in the sampling and pre-concentration system was designated to trap C2–C5 hydrocarbons, whereas the other was designed to trap other VOC species. The newly developed GC-MS/FID system was then employed to measure VOCs in ambient air, and its observation data were compared with those from three well-established techniques, including an offline GC-MS/FID coupled with canister sampling, a proton transfer reaction-mass spectrometer (PTR-MS), and an online gas chromatograph system equipped with an FID and a photo ionization detector (GC-FID/PID). The online and offline GC-MS/FID measurements for alkanes, acetylene, C2–C3 alkenes, C6–C8 aromatics, and halocarbons showed good agreement. In addition, the online GC-MS/FID measurements for C6–C9 aromatics, acetone, and methacrolein + methylvinylketone (MACR + MVK) agreed well with the PTR-MS observations. Mixing ratios of C2–C7 alkanes, C3–C5 alkenes, and C6–C8 aromatics also showed good agreement between the online GC-MS/FID and GC-FID/PID techniques. These inter-comparison results demonstrated the accuracy of online GC-MS/FID measurements for C2–C12 NMHCs, C3–C4 carbonyls, and halocarbons.

Graphical abstract: Development and validation of a cryogen-free automatic gas chromatograph system (GC-MS/FID) for online measurements of volatile organic compounds

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Publication details

The article was received on 06 Aug 2014, accepted on 06 Oct 2014 and first published on 08 Oct 2014


Article type: Paper
DOI: 10.1039/C4AY01855A
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Anal. Methods, 2014,6, 9424-9434

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    Development and validation of a cryogen-free automatic gas chromatograph system (GC-MS/FID) for online measurements of volatile organic compounds

    M. Wang, L. Zeng, S. Lu, M. Shao, X. Liu, X. Yu, W. Chen, B. Yuan, Q. Zhang, M. Hu and Z. Zhang, Anal. Methods, 2014, 6, 9424
    DOI: 10.1039/C4AY01855A

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