Intercomparison of Infrared Cavity Leak-Out Spectroscopy and Gas Chromatography-Flame Ionization for Trace Analysis of Ethane
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- 作者：Sven Thelen ; Wolfram Miekisch ; Daniel Halmer ; Jochen Schubert ; Peter Hering ; Manfred Mü ; rtz
- 刊名：Analytical Chemistry
- 出版年：2008
- 出版时间：April 15, 2008
- 年：2008
- 卷：80
- 期：8
- 页码：2768 - 2773
- 全文大小：165K
- 年卷期：v.80,no.8(April 15, 2008)
- ISSN：1520-6882
文摘
Comparison of two different methods for the measurementof ethane at the parts-per-billion (ppb) level is reported.We used cavity leak-out spectroscopy (CALOS) in the 3
m wavelength region and gas chromatography-flameionization detection (GC-FID) for the analysis of variousgas samples containing ethane fractions in synthetic air.Intraday and interday reproducibilities were studied.Intercomparing the results of two series involving sevensamples with ethane mixing ratios ranging from 0.5 to100 ppb, we found a reasonable agreement between bothmethods. The scatter plot of GC-FID data versus CALOSdata yields a linear regression slope of 1.07 ± 0.03.Furthermore, some of the ethane mixtures were checkedover the course of 1 year, which proved the long-termstability of the ethane mixing ratio. We conclude thatCALOS shows equivalent ethane analysis precision compared to GC-FID, with the significant advantage of a muchhigher time resolution (<1 s) since there is no requirement for sample preconcentration. This opens new analytical possibilities, e.g., for real-time monitoring of ethanetraces in exhaled human breath.
m wavelength region and gas chromatography-flameionization detection (GC-FID) for the analysis of variousgas samples containing ethane fractions in synthetic air.Intraday and interday reproducibilities were studied.Intercomparing the results of two series involving sevensamples with ethane mixing ratios ranging from 0.5 to100 ppb, we found a reasonable agreement between bothmethods. The scatter plot of GC-FID data versus CALOSdata yields a linear regression slope of 1.07 ± 0.03.Furthermore, some of the ethane mixtures were checkedover the course of 1 year, which proved the long-termstability of the ethane mixing ratio. We conclude thatCALOS shows equivalent ethane analysis precision compared to GC-FID, with the significant advantage of a muchhigher time resolution (<1 s) since there is no requirement for sample preconcentration. This opens new analytical possibilities, e.g., for real-time monitoring of ethanetraces in exhaled human breath.