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J Chromatogr A

Title:		Improving thermal desorption aerosol gas chromatography using a dual-trap design
Author(s):		Ren H; Xue M; An Z; Jiang J;
Address:		"State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China. State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China. Electronic address: jiangjk@tsinghua.edu.cn"
Journal Title:		J Chromatogr A
Year:		2019
Volume:		20190418
Issue:
Page Number:		247 - 252
DOI:		10.1016/j.chroma.2019.04.045
ISSN/ISBN:		1873-3778 (Electronic) 0021-9673 (Linking)
Abstract:		"Thermal desorption aerosol gas chromatography (TAG) is an effective tool for in situ analysis of particulate organic molecules. However, the performance of current TAG is limited by the detectability of low volatile compounds and the matrix effect. In this study, a dual-trap TAG system was developed to address these issues. Thermally desorbed effluent is focused by a weakly retained trap (for low volatile compounds) in a 1 m capillary column conditioned in the GC oven, followed by a strongly retained trap (for high volatile compounds). Then, the focused analytes are desorbed in a reverse flow into the GC column for analysis. Detection over a wide volatility range from C10 to C40 n-alkanes is achieved using the dual-trap TAG. We show that it has lower discrimination of injection, better linearity and higher detectability of n-alkanes. The dual-trap TAG was applied for in-situ measurement of ambient fine particles (PM(2.5)) in Beijing. Repeatable retention time of n-alkanes was demonstrated during a continuous measurement over two weeks"
Keywords:		"Aerosols/chemistry Alkanes/analysis Beijing Chromatography, Gas/*instrumentation Environmental Monitoring/*methods Hot Temperature Particulate Matter/analysis Volatilization Atmospheric particulate matter Multi-stage/multi-step trapping Online thermal ext;"
Notes:		"MedlineRen, Haixia Xue, Mo An, Zhaojin Jiang, Jingkun eng Netherlands 2019/04/30 J Chromatogr A. 2019 Aug 16; 1599:247-252. doi: 10.1016/j.chroma.2019.04.045. Epub 2019 Apr 18"