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| Titel |
Hydroxymethanesulfonic acid in size-segregated aerosol particles at nine sites in Germany |
| VerfasserIn |
S. Scheinhardt, D. van Pinxteren, K. Müller, G. Spindler, H. Herrmann |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 14, no. 9 ; Nr. 14, no. 9 (2014-05-07), S.4531-4538 |
| Datensatznummer |
250118687
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| Publikation (Nr.) |
 copernicus.org/acp-14-4531-2014.pdf |
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| Zusammenfassung |
| In the course of two field campaigns, size-segregated particle samples were
collected at nine sites in Germany, including traffic, urban, rural, marine
and mountain sites. During the chemical characterisation of the samples some
of them were found to contain an unknown substance that was later
identified as hydroxymethanesulfonic acid (HMSA). HMSA is known to be formed
during the reaction of S(IV) (HSO3− or SO32−) with
formaldehyde in the aqueous phase. Due to its stability, HMSA can act as a
reservoir species for S(IV) in the atmosphere and is therefore of interest
for the understanding of atmospheric sulfur chemistry. However, no HMSA
data are available for atmospheric particles from central Europe, and even on
a worldwide scale data are scarce. Thus, the present study now provides a
representative data set with detailed information on HMSA concentrations in
size-segregated central European aerosol particles. HMSA mass concentrations
in this data set were highly variable: HMSA was found in 224 out of 738
samples (30%), sometimes in high mass concentrations exceeding those of
oxalic acid. On average over all 154 impactor runs,
31.5 ng m−3 HMSA was found in PM10, contributing
0.21% to the total mass. The results show that the particle diameter, the
sampling location, the sampling season and the air mass origin impact the
HMSA mass concentration. Highest concentrations were found in the particle
fraction 0.42–1.2 μm, at urban sites, in winter and with eastern
(continental) air masses, respectively. The results suggest that HMSA is
formed during aging of pollution plumes. A positive correlation of HMSA with
sulfate, oxalate and PM is found (R2 > 0.4). The
results furthermore suggest that the fraction of HMSA in PM slightly
decreases with increasing pH. |
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