Critical role of a pre-purge setup in the thermal desorption analysis of volatile organic compounds by gas chromatography with mass spectrometry
- Authors
- Kim, Yong-Hyun; Kim, Ki-Hyun
- Issue Date
- Jul-2015
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- Gas chromatography; Methanol; Pre-purge; Solvent effects; Sorbent tubes
- Citation
- JOURNAL OF SEPARATION SCIENCE, v.38, no.14, pp.2455 - 2462
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF SEPARATION SCIENCE
- Volume
- 38
- Number
- 14
- Start Page
- 2455
- End Page
- 2462
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/24935
- DOI
- 10.1002/jssc.201500367
- ISSN
- 1615-9306
- Abstract
- In general, volatile organic compounds in ambient air are quantified by following a well-defined standard calibration procedure using a gas-/liquid-phase standard. If the liquid standard is analyzed by a thermal desorption, the solvent effect is unavoidable through the alteration of breakthrough properties or retention times. To learn more about the variables of the thermal desorption-based analysis, the effect of pre-purge conditions was evaluated for 18 volatile organic compounds with different types of sorbent tube materials by fixing standard volume (1 μL) and flow rate (100 mL/min). The gas phase calibration was also carried out as reference for the non-solvent effect. A single tube filled with Tenax TA exhibited the least solvent effect with the short pre-purge (1 min), while being subject to the breakthrough at or above 10 min pre-purge. For a three-bed sorbent tube with Carboxen 1000, at least 10 min of pre-purge was needed for the compounds with a retention time close to methanol (e.g., propanal). Another three-bed tube with Carbopack X reduced the solvent effect efficiently for a short pre-purge (2 min) without the breakthrough. As such, the solvent effect can be adjusted by the proper control of the sorbent tube application.
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