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| Titel |
Real-time monitoring of trace-level VOCs by an ultrasensitive lamp-based VUV photoionization mass spectrometer |
| VerfasserIn |
W. Q. Sun, J. N. Shu, P. Zhang, Z. Li, N. N. Li, M. Liang, B. Yang |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 8, no. 11 ; Nr. 8, no. 11 (2015-11-04), S.4637-4643 |
| Datensatznummer |
250116674
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| Publikation (Nr.) |
 copernicus.org/amt-8-4637-2015.pdf |
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| Zusammenfassung |
| In this study, we report on the development of a lamp-based vacuum
ultraviolet photoionization mass spectrometer (VUV-PIMS) in our laboratory;
it is composed of a radio-frequency-powered VUV lamp, a VUV photoionizer, an
ion-migration lens assembly, and a reflection time-of-flight mass
spectrometer. By utilizing the novel photoionizer consisting of a
photoionization cavity and a VUV light baffle, the baselines of the mass
spectra decreased from 263.6 ± 15.7 counts to 4.1 ± 1.8 counts.
A detection limit (2σ) of 3 pptv was achieved for benzene after an
acquisition time of 10 s. To examine its potential for real-time monitoring
applications of samples, the developed VUV-PIMS was employed for the
continuous measurement of urban air for 6 days in Beijing, China. Strong
signals of trace-level volatile organic compounds, such as benzene and its
alkylated derivatives, were observed in the mass spectra. These initial
experimental results reveal that the instrument can be used for the online
monitoring of trace-level species in the atmosphere. |
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