Tracing source and evolution of suspended particles in the Rio Negro Basin (Brazil) using chemical species of iron

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dc.contributor.authorAllard, T.
dc.contributor.authorWeber, T.
dc.contributor.authorBellot, C.
dc.contributor.authorDamblans, C.
dc.contributor.authorBardy, M.
dc.contributor.authorBueno, G. [UNESP]
dc.contributor.authorNascimento, N. R. [UNESP]
dc.contributor.authorFritsch, E.
dc.contributor.authorBenedetti, M. F.
dc.contributor.institutionUniv Paris 06
dc.contributor.institutionUniv Paris 07
dc.contributor.institutionUniv Strasbourg
dc.contributor.institutionCNRS 1
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniv Paris Diderot
dc.date.accessioned2014-05-20T14:17:24Z
dc.date.available2014-05-20T14:17:24Z
dc.date.issued2011-01-07
dc.description.abstractSuspended solids found in porewaters obtained in waterlogged soil sequences that included representative laterite-podzol transitions, associated brooks and major rivers of the Rio Negro watershed (Brazil) were studied using electron paramagnetic resonance (EPR) and Fourier-transform infrared spectroscopies. The main goal was to ascertain sources and track the evolution of suspended matter using a ubiquitous chemical species, FeIII complexed to organic matter (FeOM). Three size fractions were separated by tangential-flow (ultra)filtration: particulate (>0.2 mu m), dense (P) and light (Ps), and colloidal (5 kD<Col.<0.2 mu m) fractions. Quantitative results were acquired for Col. and Ps fractions which are predominantly organic in nature.FeOM concentration (in parts per thousand dry weight) was determined to be relatively low in suspended solids found in black waters from podzol porewaters and brooks whereas in the main rivers it was several times higher. FeOM concentrations were also correlated with Fe(II)/Fe(III) ratios in solution; these ratios were high in podzol porewaters and low in the rivers. Considering that organic complexation of Fe(II) is minor when compared to that of Fe(III), two interpretations were proposed to account for the above observation. First, [FeOM] was assumed to be distributed along a mixing line, with the clear waters from laterites and the black waters from podzols being its end-members. Consequently, [FeOM] can be used to trace the source of suspended material. Second, dissolved Fe(II) from podzol areas was considered to be progressively oxidized as pore waters move towards the mainstream. According to this mechanism, iron is complexed by organic matter or precipitated as oxides, thus producing an evolution of colloidal matter. As a result of these mechanisms' action, both the high production of Fe(II) and organic matter at the waterlogged podzol-laterite transition areas are major factors affecting iron export in the Rio Negro watershed. (C) 2010 Elsevier B.V. All rights reserved.en
dc.description.affiliationUniv Paris 06, CNRS, UMR 7590, Inst Mineral & Phys Milieux Condenses, F-75252 Paris 05, France
dc.description.affiliationUniv Paris 07, IPGP, IRD, F-75252 Paris 05, France
dc.description.affiliationUniv Strasbourg, UMR 7517, Lab Hydrol & Geochim Strasbourg, Ecole Sci Terre, F-67084 Strasbourg, France
dc.description.affiliationUniv Strasbourg, UMR 7517, Lab Hydrol & Geochim Strasbourg, Observ Sci Terre, F-67084 Strasbourg, France
dc.description.affiliationCNRS 1, F-67084 Strasbourg, France
dc.description.affiliationUNESP, DEPLAN, IGCE, BR-13500230 Rio Claro, SP, Brazil
dc.description.affiliationUniv Paris Diderot, Lab Geochim Eaux, IPGP, CNRS,UMR 7047, F-75205 Paris 13, France
dc.description.affiliationUnespUNESP, DEPLAN, IGCE, BR-13500230 Rio Claro, SP, Brazil
dc.description.sponsorshipCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
dc.description.sponsorshipInstitut des Sciences de L'Univers
dc.description.sponsorshipCentre national de la recherche scientifique (CNRS)
dc.description.sponsorshipInstitut de Recherche pour le Developpement (IRD)
dc.format.extent79-88
dc.identifierhttp://dx.doi.org/10.1016/j.chemgeo.2010.10.018
dc.identifier.citationChemical Geology. Amsterdam: Elsevier B.V., v. 280, n. 1-2, p. 79-88, 2011.
dc.identifier.doi10.1016/j.chemgeo.2010.10.018
dc.identifier.issn0009-2541
dc.identifier.lattes0510319144819921
dc.identifier.urihttp://hdl.handle.net/11449/25213
dc.identifier.wosWOS:000287016400008
dc.language.isoeng
dc.publisherElsevier B.V.
dc.relation.ispartofChemical Geology
dc.relation.ispartofjcr3.570
dc.relation.ispartofsjr1,755
dc.rights.accessRightsAcesso restrito
dc.sourceWeb of Science
dc.subjectIronen
dc.subjectColloidsen
dc.subjectOrganic matteren
dc.subjectAmazon Basinen
dc.subjectEPRen
dc.subjectPodzolen
dc.titleTracing source and evolution of suspended particles in the Rio Negro Basin (Brazil) using chemical species of ironen
dc.typeArtigo
dcterms.licensehttp://www.elsevier.com/about/open-access/open-access-policies/article-posting-policy
dcterms.rightsHolderElsevier B.V.
unesp.author.lattes0510319144819921
unesp.author.orcid0000-0003-1075-8205[9]
unesp.campusUniversidade Estadual Paulista (Unesp), Instituto de Geociências e Ciências Exatas, Rio Claropt

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