Two-dimensional gas chromatographic analysis of ambient light hydrocarbons

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/100647

Title:	Two-dimensional gas chromatographic analysis of ambient light hydrocarbons
Authors:	王家麟;Liao, Wei-Chen;Ou-Yang, Cheng-Feng;Wang, Chieh-Heng;Chang, Chih-Chung;Wang, Jia-Lin
Contributors:	理學院化學學系
Keywords:	adsorption;Analysis methods;Analytical chemistry;Applied sciences;Atmospheric pollution;Chemistry;Chromatographic methods and physical methods associated with chromatography;Chromatography, Gas - economics;Chromatography, Gas - instrumentation;Chromatography, Gas - methods;comprehensive two-dimensional gas chromatography;Deans switch;desorption;Exact sciences and technology;Flame Ionization;Gas chromatographic methods;Gas chromatography;Hydrocarbons;Hydrocarbons - analysis;Modulation;Orthogonality;Polarity;Pollution;quality control;Separation;Thermal desorption;Two dimensional;Volatility;Volatilization
Date:	2013-06-14
Issue Date:	2026-04-21 14:09:35 (UTC+8)
Publisher:	Elsevier;Amsterdam: Elsevier B.V
Abstract:	摘要： •The Deans switch was switched from the heart-cutting GC mode to the GC×GC mode to serve as a valve modulator.•A self-built Dean switch-GC×GC-FID system was used built to analyze light hydrocarbon VOCs at ambient levels.•A thermal desorption device was connect to the Dean switch GC×GC-FID system to allow in-line preconcentration of light hydrocarbons.•The orthogonality of volatility vs. adsorptivity was adopted, instead of the commonly used orthogonality of volatility vs. polarity, for GC×GC separation. Ambient level hydrocarbons lighter than C6 were analyzed by the Deans switch-modulated comprehensive two-dimensional gas chromatography (GC×GC) method with flame ionization detection (FID). A thermal desorption (TD) device built in-house connects the GC×GC system to pre-concentrate the target compounds at ambient levels prior to GC analysis. Because the conventional orthogonality based on polarity difference for normal GC×GC separation does not provide sufficient retention for the target compounds of extremely high volatility, the orthogonality of non-polar vs. adsorptive force was adopted instead. The system employed a 100% polydimethyl siloxane column serving as the first-dimension column to provide separation based on dispersive interaction, with a short PLOT column serving as the second-dimension column to provide the needed retention based on gas–solid adsorption interactions. The shortest possible length of the PLOT column was tested to minimize the modulation period (PM) and wraparound and, at the same time, to maintain the desired resolution. The tests led to the final optimal parameters of 1.1m for the PLOT column length, 9s for the PM, 0.013 for the modulation duty cycle (DC) and a modulation ratio (MR) of 3.7 with minimal wraparound. Important criteria for quality assurance of precision and linearity are reported. The low cost and ease of construction and operation make the in-house Deans switch TD-GC×GC-FID system practical and useful for the analysis of light hydrocarbons in urban or industrial environments. 其他題名： J Chromatogr A 出版者： Amsterdam: Elsevier B.V 出版日期： 2013-06-14 出處： Journal of Chromatography A, 2013-06, Vol.1294, p.122-129 版權： 2013 Elsevier B.V. 版權： 2014 INIST-CNRS 版權： Copyright © 2013 Elsevier B.V. All rights reserved. 識別號： ISSN: 0021-9673 識別號： ISSN: 1873-3778 識別號： EISSN: 1873-3778 識別號： DOI: 10.1016/j.chroma.2013.04.008 識別號： PMID: 23659976 識別號： CODEN: JOCRAM
Appears in Collections:	[Department of Chemistry] journal & Dissertation

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