Abstract
Abstract. 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.
Highlights
Ubility which was associated with an increase of dissolved processes affect Fe speciation and solubility
The elemental chemical analysis of sieved soil was performed by wavelength dispersive X-ray fluorescence (WD-XRF) using a PW-2404 spectrometer by Panalytical based on the protocol described in Guieu et al (2010)
Our results show for the first time that, under atmospheric conditions, organic ligands promote iron-dust solubility even without photo-induced processes
Summary
Ubility which was associated with an increase of dissolved processes affect Fe speciation and solubility M trations was observed and showed that the extent of organic ables both enhancing the iron solubility, in particular with complexation on iron solubility decreased in the following oxalate (Sulzberger and Laubscher 1995; Paris et al, 2011), order: oxalate >malonate = tartrate > humic acid. This was and to stabilising iron in dissolved form after wet deposition attributed to the ability of electron donors of organic ligands in seawater (Kieber et aHl. y2d00r5o).loThguys, athne datmospheric orand implies a reductive ligand-promoted dissolution. Matter (OM) such as siderophores as well as low molecular weight polycarboxylateOccomepaonundSsc(Biearnbecaeu, 2006), humic substances (Laglera and van den Berg, 2009) and saccharides
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