期刊
ANALYTICA CHIMICA ACTA
卷 1038, 期 -, 页码 59-66出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.aca.2018.08.013
关键词
Glow discharge; Mass spectrometry; Volatile organic compounds (VOCs) analysis; Gas chromatography; Direct injection; Air analysis
资金
- Ministerio de Educacion y Cultura [MINECO-13-CTQ2013-49032-C2-2-R, MINECO-17-CTQ2016-77887-C2-1-R]
An improved gas sample introduction interface is developed and characterized for gas chromatography coupling and for direct injection of volatile organic compounds (VOCs), in a pulsed glow discharge (pulsed-GD) ion source coupled to a time of flight mass spectrometer (TOFMS) that is typically used for direct solid analysis. The novel interface allows the introduction of the analytes in the flowing afterglow region of the GD (a few mm away from the negative glow region) to reduce plasma quenching effects. Analyte ion signals are acquired in the temporal afterglow region, where low fragmentation of the molecular species is produced, providing useful qualitative and quantitative molecular information (e.g. molecular ion). Analytical capabilities of the pulsed-GD ion source with the novel gas sampling interface provides improved performance compared to previous designs. In particular, limits of detection for the analysis of VOCs in air were below (better) that legally established limits according to Directive 2008/50/EC of the European Parliament. (C) 2018 Elsevier B.V. All rights reserved.
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