A structural conformation study of aquatic humic acid

Detalhes bibliográficos
Autor(a) principal: Zara, Luiz F.
Data de Publicação: 2006
Outros Autores: Rosa, André H. [UNESP], Toscano, Ilda A. S., Rocha, Julio C. [UNESP]
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1590/S0103-50532006000500028
http://hdl.handle.net/11449/69174
Resumo: In the present work, aquatic humic substances (HS) were extracted by use of adsorbent XAD 8 and the acid humic fraction (AH) was separated throught acidification. After being purified by Hyphan resin and dialyze, the aquatic AH was characterized using Fourier-transform infrared spectroscopy and elemental analysis. The influence of the aquatic HA and electrolyte concentrations, pH and aquatic AH-metal complexation time on the conformation was investigated using UV/Vis spectroscopic studies, employing the equation suggested by Doty and Steiner. The results indicated that the acid humic flexible macromolecule assumes a condensed form at acid and alkaline pH. Other factors favoring condensed conformations are longer metal complexation time (ageing) and higher aquatic AH and electrolyte concentrations. Thus considering the strong influence of the investigated parameters in the structural conformation of the humic macromolecule, we conclude that studies using UV/Vis spectroscopy to estimate the concentration, aromaticity, humification degree of the aquatic AH and so on, require rigorous control over the experimental conditions employed to provide a correct interpretation of the analytical results. ©2006 Sociedade Brasileira de Química.
id UNSP_2afb699459717f0b82d150543fdddae9
oai_identifier_str oai:repositorio.unesp.br:11449/69174
network_acronym_str UNSP
network_name_str Repositório Institucional da UNESP
repository_id_str 2946
spelling A structural conformation study of aquatic humic acidAquatic humic acidDegree of condensationUV/Vis spectroscopyIn the present work, aquatic humic substances (HS) were extracted by use of adsorbent XAD 8 and the acid humic fraction (AH) was separated throught acidification. After being purified by Hyphan resin and dialyze, the aquatic AH was characterized using Fourier-transform infrared spectroscopy and elemental analysis. The influence of the aquatic HA and electrolyte concentrations, pH and aquatic AH-metal complexation time on the conformation was investigated using UV/Vis spectroscopic studies, employing the equation suggested by Doty and Steiner. The results indicated that the acid humic flexible macromolecule assumes a condensed form at acid and alkaline pH. Other factors favoring condensed conformations are longer metal complexation time (ageing) and higher aquatic AH and electrolyte concentrations. Thus considering the strong influence of the investigated parameters in the structural conformation of the humic macromolecule, we conclude that studies using UV/Vis spectroscopy to estimate the concentration, aromaticity, humification degree of the aquatic AH and so on, require rigorous control over the experimental conditions employed to provide a correct interpretation of the analytical results. ©2006 Sociedade Brasileira de Química.Universidade Católica de Brasília Q.S. 07 EPCT, Lote 01, 72030-170 Brasília-DFDepartamento de Engenharia Ambiental Universidade Estadual Paulista, Av. 3 de Março, 511, 18087-180 Sorocaba-SPDepartamento de Química Universidade Federal da Paraíba, 58059-900 João Pessoa-PBInstituto de Química Universidade Estadual Paulista, 14800-900 Araraquara-SPDepartamento de Engenharia Ambiental Universidade Estadual Paulista, Av. 3 de Março, 511, 18087-180 Sorocaba-SPInstituto de Química Universidade Estadual Paulista, 14800-900 Araraquara-SPUniversidade Católica de Brasília (UCB)Universidade Estadual Paulista (Unesp)Universidade Federal da Paraíba (UFPB)Zara, Luiz F.Rosa, André H. [UNESP]Toscano, Ilda A. S.Rocha, Julio C. [UNESP]2014-05-27T11:22:00Z2014-05-27T11:22:00Z2006-10-16info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article1014-1019application/pdfhttp://dx.doi.org/10.1590/S0103-50532006000500028Journal of the Brazilian Chemical Society, v. 17, n. 5, p. 1014-1019, 2006.0103-5053http://hdl.handle.net/11449/6917410.1590/S0103-50532006000500028S0103-50532006000500028WOS:0002403512000282-s2.0-337495750182-s2.0-33749575018.pdf0000-0002-2042-018XScopusreponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengJournal of the Brazilian Chemical Society1.4440,357info:eu-repo/semantics/openAccess2024-01-21T06:19:49Zoai:repositorio.unesp.br:11449/69174Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T23:32:40.115616Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv A structural conformation study of aquatic humic acid
title A structural conformation study of aquatic humic acid
spellingShingle A structural conformation study of aquatic humic acid
Zara, Luiz F.
Aquatic humic acid
Degree of condensation
UV/Vis spectroscopy
title_short A structural conformation study of aquatic humic acid
title_full A structural conformation study of aquatic humic acid
title_fullStr A structural conformation study of aquatic humic acid
title_full_unstemmed A structural conformation study of aquatic humic acid
title_sort A structural conformation study of aquatic humic acid
author Zara, Luiz F.
author_facet Zara, Luiz F.
Rosa, André H. [UNESP]
Toscano, Ilda A. S.
Rocha, Julio C. [UNESP]
author_role author
author2 Rosa, André H. [UNESP]
Toscano, Ilda A. S.
Rocha, Julio C. [UNESP]
author2_role author
author
author
dc.contributor.none.fl_str_mv Universidade Católica de Brasília (UCB)
Universidade Estadual Paulista (Unesp)
Universidade Federal da Paraíba (UFPB)
dc.contributor.author.fl_str_mv Zara, Luiz F.
Rosa, André H. [UNESP]
Toscano, Ilda A. S.
Rocha, Julio C. [UNESP]
dc.subject.por.fl_str_mv Aquatic humic acid
Degree of condensation
UV/Vis spectroscopy
topic Aquatic humic acid
Degree of condensation
UV/Vis spectroscopy
description In the present work, aquatic humic substances (HS) were extracted by use of adsorbent XAD 8 and the acid humic fraction (AH) was separated throught acidification. After being purified by Hyphan resin and dialyze, the aquatic AH was characterized using Fourier-transform infrared spectroscopy and elemental analysis. The influence of the aquatic HA and electrolyte concentrations, pH and aquatic AH-metal complexation time on the conformation was investigated using UV/Vis spectroscopic studies, employing the equation suggested by Doty and Steiner. The results indicated that the acid humic flexible macromolecule assumes a condensed form at acid and alkaline pH. Other factors favoring condensed conformations are longer metal complexation time (ageing) and higher aquatic AH and electrolyte concentrations. Thus considering the strong influence of the investigated parameters in the structural conformation of the humic macromolecule, we conclude that studies using UV/Vis spectroscopy to estimate the concentration, aromaticity, humification degree of the aquatic AH and so on, require rigorous control over the experimental conditions employed to provide a correct interpretation of the analytical results. ©2006 Sociedade Brasileira de Química.
publishDate 2006
dc.date.none.fl_str_mv 2006-10-16
2014-05-27T11:22:00Z
2014-05-27T11:22:00Z
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/S0103-50532006000500028
Journal of the Brazilian Chemical Society, v. 17, n. 5, p. 1014-1019, 2006.
0103-5053
http://hdl.handle.net/11449/69174
10.1590/S0103-50532006000500028
S0103-50532006000500028
WOS:000240351200028
2-s2.0-33749575018
2-s2.0-33749575018.pdf
0000-0002-2042-018X
url http://dx.doi.org/10.1590/S0103-50532006000500028
http://hdl.handle.net/11449/69174
identifier_str_mv Journal of the Brazilian Chemical Society, v. 17, n. 5, p. 1014-1019, 2006.
0103-5053
10.1590/S0103-50532006000500028
S0103-50532006000500028
WOS:000240351200028
2-s2.0-33749575018
2-s2.0-33749575018.pdf
0000-0002-2042-018X
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Journal of the Brazilian Chemical Society
1.444
0,357
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 1014-1019
application/pdf
dc.source.none.fl_str_mv Scopus
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_ 1808129530600095744