Distribuição de metais e caracterização das constantes de troca entre espécies metálicas e frações húmicas aquáticas de diferentes tamanhos moleculares

Bibliographic Details
Main Author: Araújo, Adriana Barbosa [UNESP]
Publication Date: 2002
Other Authors: Rosa, André Henrique [UNESP], Rocha, Julio Cesar [UNESP], Romão, Luciane Pimenta Cruz
Format: Article
Language: por
Source: Repositório Institucional da UNESP
Download full: http://dx.doi.org/10.1590/S0100-40422002000700011
http://hdl.handle.net/11449/25698
Summary: In this work the metal distribution and exchange constants between metal species and aquatic humic fractions with different molecular sizes were studied. The aquatic humic substances (AHS) were extracted by XAD-8 resin from water sample collected from Itapitanguí river, São Paulo State, Brazil. The AHS were fractionated in six fractions with different molecular sizes (>100 - <5 kDa) and characterized by several techniques. Molar ratios H/C suggested higher aromaticity for fractions F1 and F6 whereas molar ratios C/N didn&acute;t show any differences regarding the humification degree between the fractions. The UV-Vis absorbance a254/a436 ratio showed higher results for F4 and F5, probably by less condensed features. FTIR studies showed high similarity in the functional groups in the fractions. The highest percentage of traces of Co, Al, Fe, Mn, Cu, Zn and Ni (determined by ICP-AES) was preferably complexed by fractions F3 and F4 with a greater amount of dissolved organic carbon (DOC). In addition, the exchange constants, determined by ultrafiltration method, showed complexes AHS-Fe and AHS-Al with higher stability than complexes AHS-Co in all fractions.
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spelling Distribuição de metais e caracterização das constantes de troca entre espécies metálicas e frações húmicas aquáticas de diferentes tamanhos molecularesMetal distribution and characterization of exchange constants between metal species and aquatic humic fractions with different molecular sizesaquatic humic substancesmetal complexesexchange constantsIn this work the metal distribution and exchange constants between metal species and aquatic humic fractions with different molecular sizes were studied. The aquatic humic substances (AHS) were extracted by XAD-8 resin from water sample collected from Itapitanguí river, São Paulo State, Brazil. The AHS were fractionated in six fractions with different molecular sizes (>100 - <5 kDa) and characterized by several techniques. Molar ratios H/C suggested higher aromaticity for fractions F1 and F6 whereas molar ratios C/N didn&acute;t show any differences regarding the humification degree between the fractions. The UV-Vis absorbance a254/a436 ratio showed higher results for F4 and F5, probably by less condensed features. FTIR studies showed high similarity in the functional groups in the fractions. The highest percentage of traces of Co, Al, Fe, Mn, Cu, Zn and Ni (determined by ICP-AES) was preferably complexed by fractions F3 and F4 with a greater amount of dissolved organic carbon (DOC). In addition, the exchange constants, determined by ultrafiltration method, showed complexes AHS-Fe and AHS-Al with higher stability than complexes AHS-Co in all fractions.Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Universidade Estadual Paulista Instituto de QuímicaUniversidade Federal do SergipeUniversidade Estadual Paulista Instituto de QuímicaSociedade Brasileira de QuímicaUniversidade Estadual Paulista (Unesp)Universidade Federal do SergipeAraújo, Adriana Barbosa [UNESP]Rosa, André Henrique [UNESP]Rocha, Julio Cesar [UNESP]Romão, Luciane Pimenta Cruz2014-05-20T14:18:55Z2014-05-20T14:18:55Z2002-12-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article1103-1107application/pdfhttp://dx.doi.org/10.1590/S0100-40422002000700011Química Nova. Sociedade Brasileira de Química, v. 25, n. 6b, p. 1103-1107, 2002.0100-4042http://hdl.handle.net/11449/2569810.1590/S0100-40422002000700011S0100-40422002000700011S0100-40422002000700011.pdf41488374036182070000-0002-2042-018XSciELOreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPporQuímica Nova0.6460,255info:eu-repo/semantics/openAccess2023-11-22T06:16:33Zoai:repositorio.unesp.br:11449/25698Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462023-11-22T06:16:33Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Distribuição de metais e caracterização das constantes de troca entre espécies metálicas e frações húmicas aquáticas de diferentes tamanhos moleculares
Metal distribution and characterization of exchange constants between metal species and aquatic humic fractions with different molecular sizes
title Distribuição de metais e caracterização das constantes de troca entre espécies metálicas e frações húmicas aquáticas de diferentes tamanhos moleculares
spellingShingle Distribuição de metais e caracterização das constantes de troca entre espécies metálicas e frações húmicas aquáticas de diferentes tamanhos moleculares
Araújo, Adriana Barbosa [UNESP]
aquatic humic substances
metal complexes
exchange constants
title_short Distribuição de metais e caracterização das constantes de troca entre espécies metálicas e frações húmicas aquáticas de diferentes tamanhos moleculares
title_full Distribuição de metais e caracterização das constantes de troca entre espécies metálicas e frações húmicas aquáticas de diferentes tamanhos moleculares
title_fullStr Distribuição de metais e caracterização das constantes de troca entre espécies metálicas e frações húmicas aquáticas de diferentes tamanhos moleculares
title_full_unstemmed Distribuição de metais e caracterização das constantes de troca entre espécies metálicas e frações húmicas aquáticas de diferentes tamanhos moleculares
title_sort Distribuição de metais e caracterização das constantes de troca entre espécies metálicas e frações húmicas aquáticas de diferentes tamanhos moleculares
author Araújo, Adriana Barbosa [UNESP]
author_facet Araújo, Adriana Barbosa [UNESP]
Rosa, André Henrique [UNESP]
Rocha, Julio Cesar [UNESP]
Romão, Luciane Pimenta Cruz
author_role author
author2 Rosa, André Henrique [UNESP]
Rocha, Julio Cesar [UNESP]
Romão, Luciane Pimenta Cruz
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidade Estadual Paulista (Unesp)
Universidade Federal do Sergipe
dc.contributor.author.fl_str_mv Araújo, Adriana Barbosa [UNESP]
Rosa, André Henrique [UNESP]
Rocha, Julio Cesar [UNESP]
Romão, Luciane Pimenta Cruz
dc.subject.por.fl_str_mv aquatic humic substances
metal complexes
exchange constants
topic aquatic humic substances
metal complexes
exchange constants
description In this work the metal distribution and exchange constants between metal species and aquatic humic fractions with different molecular sizes were studied. The aquatic humic substances (AHS) were extracted by XAD-8 resin from water sample collected from Itapitanguí river, São Paulo State, Brazil. The AHS were fractionated in six fractions with different molecular sizes (>100 - <5 kDa) and characterized by several techniques. Molar ratios H/C suggested higher aromaticity for fractions F1 and F6 whereas molar ratios C/N didn&acute;t show any differences regarding the humification degree between the fractions. The UV-Vis absorbance a254/a436 ratio showed higher results for F4 and F5, probably by less condensed features. FTIR studies showed high similarity in the functional groups in the fractions. The highest percentage of traces of Co, Al, Fe, Mn, Cu, Zn and Ni (determined by ICP-AES) was preferably complexed by fractions F3 and F4 with a greater amount of dissolved organic carbon (DOC). In addition, the exchange constants, determined by ultrafiltration method, showed complexes AHS-Fe and AHS-Al with higher stability than complexes AHS-Co in all fractions.
publishDate 2002
dc.date.none.fl_str_mv 2002-12-01
2014-05-20T14:18:55Z
2014-05-20T14:18:55Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1590/S0100-40422002000700011
Química Nova. Sociedade Brasileira de Química, v. 25, n. 6b, p. 1103-1107, 2002.
0100-4042
http://hdl.handle.net/11449/25698
10.1590/S0100-40422002000700011
S0100-40422002000700011
S0100-40422002000700011.pdf
4148837403618207
0000-0002-2042-018X
url http://dx.doi.org/10.1590/S0100-40422002000700011
http://hdl.handle.net/11449/25698
identifier_str_mv Química Nova. Sociedade Brasileira de Química, v. 25, n. 6b, p. 1103-1107, 2002.
0100-4042
10.1590/S0100-40422002000700011
S0100-40422002000700011
S0100-40422002000700011.pdf
4148837403618207
0000-0002-2042-018X
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv Química Nova
0.646
0,255
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 1103-1107
application/pdf
dc.publisher.none.fl_str_mv Sociedade Brasileira de Química
publisher.none.fl_str_mv Sociedade Brasileira de Química
dc.source.none.fl_str_mv SciELO
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
_version_ 1799965031802077184

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