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| Titel |
Characterisation and optimisation of a sample preparation method for the detection and quantification of atmospherically relevant carbonyl compounds in aqueous medium |
| VerfasserIn |
M. Rodigast, A. Mutzel, Y. Iinuma, S. Haferkorn, H. Herrmann |
| 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. 6 ; Nr. 8, no. 6 (2015-06-08), S.2409-2416 |
| Datensatznummer |
250116429
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| Publikation (Nr.) |
 copernicus.org/amt-8-2409-2015.pdf |
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| Zusammenfassung |
| Carbonyl compounds are ubiquitous in the atmosphere and either emitted
primarily from anthropogenic and biogenic sources or they are produced
secondarily from the oxidation of volatile organic compounds. Despite
a number of studies about the quantification of carbonyl compounds a
comprehensive description of optimised methods is scarce for the
quantification of atmospherically relevant carbonyl compounds. The method
optimisation was conducted for seven atmospherically relevant carbonyl
compounds including acrolein, benzaldehyde, glyoxal, methyl glyoxal,
methacrolein, methyl vinyl ketone and 2,3-butanedione.
O-(2,3,4,5,6-pentafluorobenzyl)hydroxylamine hydrochloride (PFBHA) was used
as derivatisation reagent and the formed oximes were detected by gas
chromatography/mass spectrometry (GC/MS). With the present method
quantification can be carried out for each carbonyl compound originating
from fog, cloud and rain or sampled from the gas- and particle phase in
water. Detection limits between 0.01 and 0.17 μmol L−1 were
found, depending on carbonyl compounds. Furthermore, best results were found
for the derivatisation with a PFBHA concentration of 0.43 mg mL−1 for
24 h followed by a subsequent extraction with dichloromethane for 30 min at
pH = 1. The optimised method was evaluated in the present study by the OH
radical initiated oxidation of 3-methylbutanone in the aqueous phase. Methyl
glyoxal and 2,3-butanedione were found to be oxidation products in the
samples with a yield of 2% for methyl glyoxal and 14% for
2,3-butanedione after a reaction time of 5 h. |
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