Substâncias húmicas aquáticas: fracionamento molecular e caracterização de rearranjos internos após complexação com íons metálicos

Detalhes bibliográficos
Autor(a) principal: Sargentini Junior, Ézio
Data de Publicação: 2001
Outros Autores: Rocha, Julio Cesar [UNESP], Rosa, André Henrique [UNESP], Zara, Luiz Fabricio [UNESP], Santos, Ademir dos [UNESP]
Tipo de documento: Artigo
Idioma: por
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1590/S0100-40422001000300010
http://hdl.handle.net/11449/27573
Resumo: The aquatic humic substances (AHS) investigated in this study were conventionally isolated from Rio Negro waters - Amazonas State/Brazil by means of the collector XAD 8. A special five-stage tangential-flow ultrafiltration device was used for analytical fractionation of AHS. The fractionation patterns (6 fractions each) showed that metal traces remaining in AHS after their XAD 8 isolation have different size distributions. For instance, the major percentage of traces of Ni, Cu, Zn, Cd and Pb (determined using ICP-AES) was preferably complexed by molecules with relatively high molecular size (30-100 kDa) and the following complexation order was characterized: F2 >> F1 = F4 = F5 > F3 > F6. Moreover, the species formed between AHS and metals prepared by spiking, showed distribution patterns changing as a function of the complexation time (ageing process), indicating a slow transformation process and an inner rearrangements in the binding sites within the AHS molecules.
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spelling Substâncias húmicas aquáticas: fracionamento molecular e caracterização de rearranjos internos após complexação com íons metálicosAquatic humic substances: molecular size fractionation and characterization of inner rearrangements after metal ions complexationaquatic humic substancesfractionationmetal ionsThe aquatic humic substances (AHS) investigated in this study were conventionally isolated from Rio Negro waters - Amazonas State/Brazil by means of the collector XAD 8. A special five-stage tangential-flow ultrafiltration device was used for analytical fractionation of AHS. The fractionation patterns (6 fractions each) showed that metal traces remaining in AHS after their XAD 8 isolation have different size distributions. For instance, the major percentage of traces of Ni, Cu, Zn, Cd and Pb (determined using ICP-AES) was preferably complexed by molecules with relatively high molecular size (30-100 kDa) and the following complexation order was characterized: F2 >> F1 = F4 = F5 > F3 > F6. Moreover, the species formed between AHS and metals prepared by spiking, showed distribution patterns changing as a function of the complexation time (ageing process), indicating a slow transformation process and an inner rearrangements in the binding sites within the AHS molecules.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)Instituto Nacional de Pesquisas da AmazôniaUNESP Instituto de Química de AraraquaraUniversidade de São Paulo Instituto de Química de São CarlosUNESP Instituto de Química de AraraquaraSociedade Brasileira de QuímicaInstituto Nacional de Pesquisas da Amazônia (INPA)Universidade Estadual Paulista (Unesp)Universidade de São Paulo (USP)Sargentini Junior, ÉzioRocha, Julio Cesar [UNESP]Rosa, André Henrique [UNESP]Zara, Luiz Fabricio [UNESP]Santos, Ademir dos [UNESP]2014-05-20T15:10:18Z2014-05-20T15:10:18Z2001-06-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article339-344application/pdfhttp://dx.doi.org/10.1590/S0100-40422001000300010Química Nova. Sociedade Brasileira de Química, v. 24, n. 3, p. 339-344, 2001.0100-4042http://hdl.handle.net/11449/2757310.1590/S0100-40422001000300010S0100-40422001000300010S0100-40422001000300010.pdf41488374036182070000-0002-2042-018XSciELOreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPporQuímica Nova0.6460,255info:eu-repo/semantics/openAccess2024-01-14T06:22:32Zoai:repositorio.unesp.br:11449/27573Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T22:56:50.710757Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Substâncias húmicas aquáticas: fracionamento molecular e caracterização de rearranjos internos após complexação com íons metálicos
Aquatic humic substances: molecular size fractionation and characterization of inner rearrangements after metal ions complexation
title Substâncias húmicas aquáticas: fracionamento molecular e caracterização de rearranjos internos após complexação com íons metálicos
spellingShingle Substâncias húmicas aquáticas: fracionamento molecular e caracterização de rearranjos internos após complexação com íons metálicos
Sargentini Junior, Ézio
aquatic humic substances
fractionation
metal ions
title_short Substâncias húmicas aquáticas: fracionamento molecular e caracterização de rearranjos internos após complexação com íons metálicos
title_full Substâncias húmicas aquáticas: fracionamento molecular e caracterização de rearranjos internos após complexação com íons metálicos
title_fullStr Substâncias húmicas aquáticas: fracionamento molecular e caracterização de rearranjos internos após complexação com íons metálicos
title_full_unstemmed Substâncias húmicas aquáticas: fracionamento molecular e caracterização de rearranjos internos após complexação com íons metálicos
title_sort Substâncias húmicas aquáticas: fracionamento molecular e caracterização de rearranjos internos após complexação com íons metálicos
author Sargentini Junior, Ézio
author_facet Sargentini Junior, Ézio
Rocha, Julio Cesar [UNESP]
Rosa, André Henrique [UNESP]
Zara, Luiz Fabricio [UNESP]
Santos, Ademir dos [UNESP]
author_role author
author2 Rocha, Julio Cesar [UNESP]
Rosa, André Henrique [UNESP]
Zara, Luiz Fabricio [UNESP]
Santos, Ademir dos [UNESP]
author2_role author
author
author
author
dc.contributor.none.fl_str_mv Instituto Nacional de Pesquisas da Amazônia (INPA)
Universidade Estadual Paulista (Unesp)
Universidade de São Paulo (USP)
dc.contributor.author.fl_str_mv Sargentini Junior, Ézio
Rocha, Julio Cesar [UNESP]
Rosa, André Henrique [UNESP]
Zara, Luiz Fabricio [UNESP]
Santos, Ademir dos [UNESP]
dc.subject.por.fl_str_mv aquatic humic substances
fractionation
metal ions
topic aquatic humic substances
fractionation
metal ions
description The aquatic humic substances (AHS) investigated in this study were conventionally isolated from Rio Negro waters - Amazonas State/Brazil by means of the collector XAD 8. A special five-stage tangential-flow ultrafiltration device was used for analytical fractionation of AHS. The fractionation patterns (6 fractions each) showed that metal traces remaining in AHS after their XAD 8 isolation have different size distributions. For instance, the major percentage of traces of Ni, Cu, Zn, Cd and Pb (determined using ICP-AES) was preferably complexed by molecules with relatively high molecular size (30-100 kDa) and the following complexation order was characterized: F2 >> F1 = F4 = F5 > F3 > F6. Moreover, the species formed between AHS and metals prepared by spiking, showed distribution patterns changing as a function of the complexation time (ageing process), indicating a slow transformation process and an inner rearrangements in the binding sites within the AHS molecules.
publishDate 2001
dc.date.none.fl_str_mv 2001-06-01
2014-05-20T15:10:18Z
2014-05-20T15:10:18Z
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/S0100-40422001000300010
Química Nova. Sociedade Brasileira de Química, v. 24, n. 3, p. 339-344, 2001.
0100-4042
http://hdl.handle.net/11449/27573
10.1590/S0100-40422001000300010
S0100-40422001000300010
S0100-40422001000300010.pdf
4148837403618207
0000-0002-2042-018X
url http://dx.doi.org/10.1590/S0100-40422001000300010
http://hdl.handle.net/11449/27573
identifier_str_mv Química Nova. Sociedade Brasileira de Química, v. 24, n. 3, p. 339-344, 2001.
0100-4042
10.1590/S0100-40422001000300010
S0100-40422001000300010
S0100-40422001000300010.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 339-344
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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