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| Titel |
Effect of atmospheric organic complexation on iron-bearing dust solubility |
| VerfasserIn |
R. Paris, K. V. Desboeufs |
| 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. 9 ; Nr. 13, no. 9 (2013-05-14), S.4895-4905 |
| Datensatznummer |
250018647
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| Publikation (Nr.) |
 copernicus.org/acp-13-4895-2013.pdf |
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| Zusammenfassung |
| Recent studies reported that the effect of organic complexation may be a
potentially important process to be considered by models estimating
atmospheric iron flux to the ocean. In this study, we investigated this
process effect by a series of dissolution experiments on iron-bearing dust in the
presence or the absence of various organic compounds (acetate, formate, oxalate, malonate, succinate,
glutarate, glycolate, lactate, tartrate and humic acid as an analogue of
humic like substances, HULIS) typically found in
atmospheric waters. Only 4 of tested organic ligands (oxalate,
malonate, tartrate and humic acid) caused an enhancement of iron solubility
which was associated with an increase of dissolved Fe(II) concentrations.
For all of these organic ligands, a positive linear dependence of iron
solubility to organic concentrations was observed and showed that the extent
of organic complexation on iron solubility decreased in the following order: oxalate
>malonate = tartrate > humic acid. This was
attributed to the ability of electron donors of organic ligands and implies
a reductive ligand-promoted dissolution. This study confirms that among the
known atmospheric organic binding ligands of Fe, oxalate is the most
effective ligand promoting dust iron solubility and showed, for the first
time, the potential effect of HULIS on iron dissolution under atmospheric
conditions. |
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