A structural conformation study of aquatic humic acid
Autor(a) principal: | |
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Data de Publicação: | 2006 |
Outros Autores: | , , |
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. |
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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 |