Distribuição de metais e caracterização das constantes de troca entre espécies metálicas e frações húmicas aquáticas de diferentes tamanhos moleculares
Autor(a) principal: | |
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Data de Publicação: | 2002 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Repositório Institucional da UNESP |
Texto Completo: | http://dx.doi.org/10.1590/S0100-40422002000700011 http://hdl.handle.net/11449/25698 |
Resumo: | 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´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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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´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:29462024-08-05T18:26:40.351410Repositório 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´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 |
|
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1808128932400070656 |