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| Titel |
Glyoxal and methylglyoxal in Atlantic seawater and marine aerosol particles: method development and first application during the Polarstern cruise ANT XXVII/4 |
| VerfasserIn |
M. van Pinxteren, 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 ; 13, no. 23 ; Nr. 13, no. 23 (2013-12-05), S.11791-11802 |
| Datensatznummer |
250085856
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| Publikation (Nr.) |
 copernicus.org/acp-13-11791-2013.pdf |
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| Zusammenfassung |
| An analytical method for the determination of the alpha dicarbonyls glyoxal
(GLY) and methylglyoxal (MGLY) from seawater and marine aerosol particles is
presented. The method is based on derivatization with
o-(2,3,4,5,6-Pentafluorobenzyl)-hydroxylamine (PFBHA) reagent, solvent
extraction and GC-MS (SIM) analysis. The method showed good precision
(RSD < 10%), sensitivity (detection limits in the low ng L−1 range),
and accuracy (good agreement between external calibration and standard
addition). The method was applied to determine GLY and MGLY in oceanic water
sampled during the Polarstern cruise ANT XXVII/4 from Capetown to
Bremerhaven in spring 2011. GLY and MGLY were determined in the sea surface
microlayer (SML) of the ocean and corresponding bulk water (BW) with average
concentrations of 228 ng L−1 (GLY) and 196 ng L−1 (MGLY). The
results show a significant enrichment (factor of 4) of GLY and MGLY in the
SML. Furthermore, marine aerosol particles (PM1) were sampled during
the cruise and analyzed for GLY (average concentration 0.19 ng m−3) and
MGLY (average concentration 0.15 ng m−3). On aerosol particles, both
carbonyls show a very good correlation with oxalate, supporting the idea of
a secondary formation of oxalic acid via GLY and MGLY. Concentrations of GLY
and MGLY in seawater and on aerosol particles were correlated to
environmental parameters such as global radiation, temperature, distance to
the coastline and biological activity. There are slight hints for a
photochemical production of GLY and MGLY in the SML (significant enrichment
in the SML, higher enrichment at higher temperature). However, a clear
connection of GLY and MGLY to global radiation as well as to biological
activity cannot be concluded from the data. A slight correlation between GLY
and MGLY in the SML and in aerosol particles could be a hint for
interactions, in particular of GLY, between seawater and the atmosphere. |
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