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| Titel |
Performance of a corona ion source for measurement of sulfuric acid by chemical ionization mass spectrometry |
| VerfasserIn |
A. Kürten, L. Rondo, S. Ehrhart, J. Curtius |
| 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 ; 4, no. 3 ; Nr. 4, no. 3 (2011-03-03), S.437-443 |
| Datensatznummer |
250001794
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| Publikation (Nr.) |
 copernicus.org/amt-4-437-2011.pdf |
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| Zusammenfassung |
| The performance of an ion source based on corona discharge has been studied.
This source is used for the detection of gaseous sulfuric acid by chemical
ionization mass spectrometry (CIMS) through the reaction of NO3– ions
with H2SO4. The ion source is operated under atmospheric
pressure and its design is similar to the one of a radioactive
(americium-241) ion source which has been used previously. The results show
that the detection limit for the corona ion source is sufficiently good for
most applications. For an integration time of 1 min it is ~6 × 104
molecule cm−3 of H2SO4. In addition, only a small
cross-sensitivity to SO2 has been observed for concentrations as high
as 1 ppmv in the sample gas. This low sensitivity to SO2 is achieved
even without the addition of an OH scavenger. When comparing the new corona
ion source with the americium ion source for the same provided
H2SO4 concentration, both ion sources yield almost identical
values. These features make the corona ion source investigated here
favorable over the more commonly used radioactive ion sources for most
applications where H2SO4 is measured by CIMS. |
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