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| Titel |
A study of the phase transition behavior of internally mixed ammonium sulfate - malonic acid aerosols |
| VerfasserIn |
C. F. Braban, J. P. D. Abbatt |
| 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 ; 4, no. 5 ; Nr. 4, no. 5 (2004-09-01), S.1451-1459 |
| Datensatznummer |
250001954
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| Publikation (Nr.) |
 copernicus.org/acp-4-1451-2004.pdf |
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| Zusammenfassung |
| This is a study into the phase transitions of aerosol composed of the
ternary system ammonium sulfate (AS) - malonic acid (MA) - water using
infrared extinction spectroscopy. Twelve compositions were studied in both
deliquescence and efflorescence mode experiments. The presence of a MA
fraction, by dry mass, (fMA) of 0.1 in an AS aerosol altered the
relative humidity at which the phase transitions occur in an atmospherically
significant manner. For compositions with 0.25<fMA<0.90, no
distinct ``deliquescence" was observed, contrary to the observed behavior in
the binary systems. The crystallization of both the MA and AS components is
suppressed by the presence of the other component in the aerosol. At
fMA=0.9, the crystallization relative humidity of MA was lowered from
RH=6% to less than 1%. Similarly, at fMA=0.4, the AS component
did not crystallize. The atmospheric implications of the results are
discussed. |
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