2013
DOI: 10.4319/lo.2013.58.2.0653
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Contribution of ferric iron to light absorption by chromophoric dissolved organic matter

Abstract: This study experimentally determined the contribution of ferric iron (Fe(III)) associated with humic substances (HS) to light absorption by chromophoric dissolved organic matter (CDOM). The associations between Fe(III) and HS (HS‐Fe) were generated by mixing HS standards with Fe(III) in acidic conditions and adjusting pH to 8. HS‐associated Fe was separated from total Fe by filtering (0.7 µm and 0.2 µm filters) and by removing the free Fe ions by cation exchange chromatography. The maximum Fe‐binding capacitie… Show more

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Cited by 96 publications
(69 citation statements)
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“…High φ 330 s correlate positively with CDOM, the specific UV absorption coefficient and the aromaticity of tDOC , which are typically highest for tDOC imported freshly from land to inland waters without earlier exposure to solar radiation [Salonen and Vähätalo, 1994;Xiao et al, 2013Xiao et al, , 2015.…”
Section: The Annual Areal Rates Of Dic Photoproduction From Tdoc In Rmentioning
confidence: 99%
See 1 more Smart Citation
“…High φ 330 s correlate positively with CDOM, the specific UV absorption coefficient and the aromaticity of tDOC , which are typically highest for tDOC imported freshly from land to inland waters without earlier exposure to solar radiation [Salonen and Vähätalo, 1994;Xiao et al, 2013Xiao et al, , 2015.…”
Section: The Annual Areal Rates Of Dic Photoproduction From Tdoc In Rmentioning
confidence: 99%
“…Aliquots of the same river water samples have been examined earlier (Tables S2, S3) to show that the chromophores of iron can contribute to the tCDOM (several percent of tCDOM in the Congo and Amazon Rivers for example) [Xiao et al, 2013], and that dissolved black carbon (DBC) contributes about 10% to tDOC in all rivers [Jaffé et al, 2013]. Photomineralization leads to the preferential removal of the 12 C-isotope from tDOC [Lalonde et al, 2014] and, together with biodegradation, to a decrease in the contribution of DBC to tDOC to a level comparable to the concentrations measured in the deep ocean [Riedel et al, 2016].…”
Section: Sample Collectionmentioning
confidence: 99%
“…The samples were not refrigerated during transportation (about one week in most cases), but they were stored at 4 • C in the dark upon arrival in Helsinki. The same water samples used here have been also examined for the concentration of dissolved black carbon and the contribution of iron to CDOM Xiao et al, 2013). Additional samples from the St. Lawrence River were collected at the same time as the polyethylene container, filtered onboard (pre-combusted GF/F filters, 0.7 µm nominal pore size), acidified with ultrapure HCl to a pH < 2, and stored in pre-combusted glass vials.…”
Section: Riverine Samplesmentioning
confidence: 99%
“…UV-VIS spectra of all samples were recorded with a Lambda 25 (Perkin Elmer, USA) in the range of 200-800 nm at 0.5 nm resolution. A possible iron interference was excluded as the maximum iron concentration of 500 µg L −1 (and an iron to carbon ratio of about 0.01) was well be-low published critical concentration levels (see Weishaar et al, 2003;Xiao et al, 2013;Poulin et al, 2014). For subsequent fluorescence spectroscopy, samples were diluted to absorption < 0.3 at 254 nm to reduce inner-filter effects.…”
Section: Laboratory Analysis Indices and Parafac Modelingmentioning
confidence: 99%