Isomeric analysis of BTEXs in the atmosphere using β-cyclodextrin capillary chromatography coupled with thermal desorption and mass spectrometry
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- 作者：Noureddine Yassaa ; Enzo Brancaleoni ; Massimiliano Frattoni and Paolo Ciccioli
- 关键词：VOCs ; BTEXs ; Air tunnel ; β ; -cyclodextrin capillary chromatography ; Graphitic carbon adsorbents ; Thermal desorption ; GC/MS
- 刊名：Chemosphere
- 出版年：2006
- 出版时间：April 2006
- 年：2006
- 卷：63
- 期：3
- 页码：502-508
- 全文大小：521 K
文摘
An analytical method capable of determining trace levels of BTEX-aromatics (benzene, toluene, ethylbenzene, m-, p- and o-xylenes) in the atmosphere with as high resolution as possible has been developed. The method is based on the preconcentration of air samples using a multibed tube (Carbopack C, Carbograph 1) at ambient temperature, followed by thermal desorption, and analysis of aromatic species by a β-cyclodextrin capillary chromatography coupled with mass spectrometry. The resolution achieved was sufficient for individual separation of BTEXs as well as m- and p-xylenes. The BTEX-ratios have been determined in an air tunnel and in on-road, suburban and rural forest atmosphere. The ethylbenzene/m-xylene ratios could provide a deep insight into anthropogenic related NMHC patterns at different locations and under different meteorological conditions and may reflect photochemical processes in the best way.