Selective Detection of Volatile Aromatic Compounds Using a Compact Laser Ionization Detector with Fast Gas Chromatography
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- 作者：Melissa J. Meyer ; Gregg M. Schieffer ; Eric K. Moeker ; Jeremy J. Brodersen ; Orven F. Swenson ; and Anthony J. Borgerding
- 刊名：Analytical Chemistry
- 出版年：2004
- 出版时间：March 15, 2004
- 年：2004
- 卷：76
- 期：6
- 页码：1702 - 1707
- 全文大小：89K
- 年卷期：v.76,no.6(March 15, 2004)
- ISSN：1520-6882
文摘
We report results for a new gas chromatography detectorthat is comparatively sensitive and far more selective foraromatic compounds than the traditional photoionization detector. The detection means is multiphoton ionization at atmospheric pressure. The ionization source inthese experiments is a diode-pumped passively Q-switched microchip laser operating at 266 nm. Experiments were conducted with the detector interfaced to afast gas chromatograph. For <20 s elution time, limits ofdetection were <1 pg for toluene, ethylbenzene, xylenes,and isopropylbenzene; the limit of detection for benzeneis ~10 pg. Detector response was linear over 5 orders ofmagnitude, including these low levels. Negligible signalswere observed for nonaromatic ketones, aldehydes, ethers,and cycloalkanes at levels as high as 0.1 
g (10 mg/Lconcentration). Detector efficiency after fast GC separationwas 0.002% when using a detector cell with a radius of1.1 cm and a purge gas flow of 500 mL/min. Theadvantages of this detector are further illustrated by thefast GC analysis of fuel samples.
g (10 mg/Lconcentration). Detector efficiency after fast GC separationwas 0.002% when using a detector cell with a radius of1.1 cm and a purge gas flow of 500 mL/min. Theadvantages of this detector are further illustrated by thefast GC analysis of fuel samples.