Improved detection limit of the proton-transfer reaction mass spectrometer: on-line monitoring of volatile organic compounds at mixing ratios of a few pptv
✍ Scribed by A. Hansel; A. Jordan; C. Warneke; R. Holzinger; W. Lindinger
- Publisher
- John Wiley and Sons
- Year
- 1998
- Tongue
- English
- Weight
- 324 KB
- Volume
- 12
- Category
- Article
- ISSN
- 0951-4198
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✦ Synopsis
The sensitivity of our proton-transfer reaction mass spectrometer system has been improved by nearly two orders of magnitude, so that now on-line monitoring of volatile organic compounds at levels of a few pptv is possible. This has been demonstrated by means of calibration data down to 200 pptv and data on the diurnal variation of C9-alkylbenzene and its 13 C-isotope in ambient air obtained at the western outskirts of Innsbruck. During night time the concentration of C9-alkylbenzene showed minimum values of about 200 pptv and its 13 C-isotope, representing concentrations of ca. 20 pptv, closely followed time dependent relative variations of 10%, indicating a detection limit of 2 to 5 pptv.