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| Titel |
Comparison of GC/time-of-flight MS with GC/quadrupole MS for halocarbon trace gas analysis |
| VerfasserIn |
J. Hoker, F. Obersteiner, H. Bönisch, A. Engel |
| 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. 5 ; Nr. 8, no. 5 (2015-05-27), S.2195-2206 |
| Datensatznummer |
250116369
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| Publikation (Nr.) |
 copernicus.org/amt-8-2195-2015.pdf |
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| Zusammenfassung |
| We present the application of time-of-flight mass spectrometry (TOF
MS) for the analysis of halocarbons in the atmosphere after
cryogenic sample preconcentration and gas chromatographic
separation. For the described field of application, the quadrupole
mass spectrometer (QP MS) is a state-of-the-art detector. This
work aims at comparing two commercially available instruments, a QP
MS and a TOF MS, with respect to mass resolution, mass accuracy,
stability of the mass axis and instrument
sensitivity, detector sensitivity, measurement precision and detector
linearity. Both mass spectrometers are operated on the same gas
chromatographic system by
splitting the column effluent to both detectors. The QP MS had to
be operated in optimised single ion monitoring (SIM) mode to achieve
a sensitivity which could compete with the TOF MS. The TOF MS
provided full mass range information in any acquired mass spectrum
without losing sensitivity. Whilst the QP MS showed the performance
already achieved in earlier tests, the sensitivity of the TOF MS was
on average higher than that of the QP MS in the "operational" SIM
mode by a factor of up to 3, reaching detection limits of less than
0.2 pg. Measurement precision determined for the whole
analytical system was up to 0.2% depending on substance and
sampled volume. The TOF MS instrument used for this study displayed
significant non-linearities of up to 10% for two-thirds of all
analysed substances. |
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