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Generation of sub-ppb level vapor phase mixtures of biogenic volatile organic compounds from liquid phase standards and stepwise characterization of their volatilization properties by thermal desorption-gas chromatography-mass spectrometry

Authors
Iqbal, Mohammad AsifKim, Ki-Hyun
Issue Date
Dec-2014
Publisher
ELSEVIER SCIENCE BV
Keywords
Biogenic volatile organic compounds; Gaseous standard; Headspace; Sorbent tube; Spiked standard; Sweep cycle
Citation
JOURNAL OF CHROMATOGRAPHY A, v.1373, pp.149 - 158
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF CHROMATOGRAPHY A
Volume
1373
Start Page
149
End Page
158
URI
https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/25710
DOI
10.1016/j.chroma.2014.10.086
ISSN
0021-9673
Abstract
In the analysis of biogenic volatile organic compounds (BVOCs) in ambient air, preparation of a sub-ppb level standard is an important factor. This task is very challenging as most BVOCs (e.g., monoterpenes) are highly volatile and reactive in nature. As a means to produce sub-ppb gaseous standards for BVOCs, we investigated the dynamic headspace (HS) extraction technique through which their vapors are generated from a liquid standard (mixture of 10 BVOCs: (1) α-pinene, (2) β-pinene, (3) 3-carene, (4) myrcene, (5) α-phellandrene, (6) α-terpinene, (7) R-limonene, (8) γ-terpinene, (9) p-cymene, and (10) Camphene) spiked into a chamber-style impinger. The quantification of BVOCs was made by collection on multiple-bed sorbent tubes (STs) and subsequent analysis by thermal desorption-gas chromatography-mass spectrometry (TD-GC-MS). Using this approach, sub-ppb level mixtures of gaseous BVOCs were generated at different sweep cycles. The mean concentrations of 10 BVOCs generated from the most stable conditions (i.e., in the third sweep cycle) varied in the range of 0.37. ±. 0.05 to 7.27. ±. 0.86. ppb depending on the initial concentration of liquid standard spiked into the system. The reproducibility of the gaseous BVOCs generated as mixture standards, if expressed in terms of relative standard error using the concentration datasets acquired under stable conditions, ranged from 1.64 (α-phellandrene) to 9.67% (R-limonene).
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