Iron speciation in coastal rainwater: concentration and deposition to seawater

Kieber, Robert J.; Williams, Kelly; Willey, Joan D.; Skrabal, Stephen A.; Avery, G. Brooks

doi:10.1016/s0304-4203(00)00097-9

Cited by 91 publications

(117 citation statements)

References 41 publications

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“…Thus, our results suggest that the initial dissolved iron is mainly Fe(II)-organic complex under dark conditions. These Fe(II) ratings are in the same order of magnitude as those reported in the literature, where DFe(II)/DFe T mean ratios higher than 50 % are observed in the atmospheric waters (Behra and Sigg, 1990;Özsoy and Saydam, 2001;Kieber et al, 2001). It is known that iron redox species are involved in numerous (photo)chemical reactions in cloud-and raindrops, such as the oxidation of S(IV), the budget of H 2 O 2 , the formation of free radicals (OH, HO 2 /O − 2 ) and the oxidation of ozone Deguillaume et al, 2004;Ben'ko and Lunin, 2010).…”

Section: Iron Solubility and Redox Speciationsupporting

confidence: 84%

“…It is known that iron redox species are involved in numerous (photo)chemical reactions in cloud-and raindrops, such as the oxidation of S(IV), the budget of H 2 O 2 , the formation of free radicals (OH, HO 2 /O − 2 ) and the oxidation of ozone Deguillaume et al, 2004;Ben'ko and Lunin, 2010). This modifies the redox cycling between Fe(II) and Fe(III) and implies a temporal pattern of Fe(II) and Fe(III) ratio with predominance of Fe(II) throughout the day (Zhu et al, 1997;Siefert et al, 1998;Kieber et al, 2001, Deutsch et al, 2001). Thus, the organic Fe(II)-complexes released by dissolution could be not stable.…”

Section: Iron Solubility and Redox Speciationmentioning

confidence: 99%

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Effect of atmospheric organic complexation on iron-bearing dust solubility

2013

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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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Section: Iron Solubility and Redox Speciationsupporting

confidence: 84%

Section: Iron Solubility and Redox Speciationmentioning

confidence: 99%

Effect of atmospheric organic complexation on iron-bearing dust solubility

2013

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“…The most likely mechanism for this pattern is stabilization as an organic-Fe(II) complex. Kieber et al (2001) found that Fe(II) accounted for more than 80% of total dissolved Fe in rainwater collected in coastal areas of North Carolina and New Zealand.…”

Section: Relation Of Iron Chemistry To Dissolved Organic Carbon Ph mentioning

confidence: 99%

Dynamics of oxidized and reduced iron in a northern hardwood forest

et al. 2010

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“…20 phf) in these experiments and considered the concentrations of materials in previous work. For example, Fe(lI1) concentrations used here were outside the range of Fe(III) concentrations observed in rainwater (up to 1 and seawater (21), although readily observable in some rivers (e.g. the Satilla River, Georgia) (22).…”

Section: Methodsmentioning

confidence: 79%