Multi-method Study on Aquatic Humic Substances from the "Rio Negro" - Amazonas State/Brazil. Emphasis on Molecular-Size Classification of their Metal Contents

Detalhes bibliográficos
Autor(a) principal: Rocha, Júlio César
Data de Publicação: 1999
Outros Autores: Sargentini, Ézio, Toscano, Ilda Antonieta Salata, Rosa, André Henrique, Burba, Peter
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional do INPA
Texto Completo: https://repositorio.inpa.gov.br/handle/1/16439
Resumo: The aquatic humic substances investigated in this study were conventionally isolated from Rio Negro waters - Amazonas State/Brazil by means of the collector XAD 8. Molecular spectroscopy investigations of these humic substances using 1H-NMR and 13C-NMR indicated the presence of high aromaticity with few substituents, small amounts of carboxylic carbon, and an aliphatic/aromatic ratio of 1:1. The relatively high UV-VIS absorbance E350/E450 ratio suggested the presence of relatively large proportions of aliphatic structures. Moreover, using a five-stage tangential-flow ultrafiltration (UF) device, the molecular-size distribution of the isolated humic substances was characterized. The fractionation patterns showed that metal traces remaining in humic substances after their XAD 8 isolation have different size distributions. For instance, Mn, Cu, Cd and Ni quantified by ICP-AES were preferably found in the high molecular-weight fractions (10-100 kDa).
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spelling Rocha, Júlio CésarSargentini, ÉzioToscano, Ilda Antonieta SalataRosa, André HenriqueBurba, Peter2020-06-05T17:59:43Z2020-06-05T17:59:43Z1999https://repositorio.inpa.gov.br/handle/1/1643910.1590/S0103-50531999000300002The aquatic humic substances investigated in this study were conventionally isolated from Rio Negro waters - Amazonas State/Brazil by means of the collector XAD 8. Molecular spectroscopy investigations of these humic substances using 1H-NMR and 13C-NMR indicated the presence of high aromaticity with few substituents, small amounts of carboxylic carbon, and an aliphatic/aromatic ratio of 1:1. The relatively high UV-VIS absorbance E350/E450 ratio suggested the presence of relatively large proportions of aliphatic structures. Moreover, using a five-stage tangential-flow ultrafiltration (UF) device, the molecular-size distribution of the isolated humic substances was characterized. The fractionation patterns showed that metal traces remaining in humic substances after their XAD 8 isolation have different size distributions. For instance, Mn, Cu, Cd and Ni quantified by ICP-AES were preferably found in the high molecular-weight fractions (10-100 kDa).Volume 10, Número 3, Pags. 169-175Attribution-NonCommercial-NoDerivs 3.0 Brazilhttp://creativecommons.org/licenses/by-nc-nd/3.0/br/info:eu-repo/semantics/openAccessMulti-method Study on Aquatic Humic Substances from the "Rio Negro" - Amazonas State/Brazil. Emphasis on Molecular-Size Classification of their Metal Contentsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleJournal of the Brazilian Chemical Societyengreponame:Repositório Institucional do INPAinstname:Instituto Nacional de Pesquisas da Amazônia (INPA)instacron:INPAORIGINALartigo-inpa.pdfartigo-inpa.pdfapplication/pdf87223https://repositorio.inpa.gov.br/bitstream/1/16439/1/artigo-inpa.pdfa6c55fa57544b810020620556798450bMD511/164392020-06-05 14:15:57.731oai:repositorio:1/16439Repositório de PublicaçõesPUBhttps://repositorio.inpa.gov.br/oai/requestopendoar:2020-06-05T18:15:57Repositório Institucional do INPA - Instituto Nacional de Pesquisas da Amazônia (INPA)false
dc.title.en.fl_str_mv Multi-method Study on Aquatic Humic Substances from the "Rio Negro" - Amazonas State/Brazil. Emphasis on Molecular-Size Classification of their Metal Contents
title Multi-method Study on Aquatic Humic Substances from the "Rio Negro" - Amazonas State/Brazil. Emphasis on Molecular-Size Classification of their Metal Contents
spellingShingle Multi-method Study on Aquatic Humic Substances from the "Rio Negro" - Amazonas State/Brazil. Emphasis on Molecular-Size Classification of their Metal Contents
Rocha, Júlio César
title_short Multi-method Study on Aquatic Humic Substances from the "Rio Negro" - Amazonas State/Brazil. Emphasis on Molecular-Size Classification of their Metal Contents
title_full Multi-method Study on Aquatic Humic Substances from the "Rio Negro" - Amazonas State/Brazil. Emphasis on Molecular-Size Classification of their Metal Contents
title_fullStr Multi-method Study on Aquatic Humic Substances from the "Rio Negro" - Amazonas State/Brazil. Emphasis on Molecular-Size Classification of their Metal Contents
title_full_unstemmed Multi-method Study on Aquatic Humic Substances from the "Rio Negro" - Amazonas State/Brazil. Emphasis on Molecular-Size Classification of their Metal Contents
title_sort Multi-method Study on Aquatic Humic Substances from the "Rio Negro" - Amazonas State/Brazil. Emphasis on Molecular-Size Classification of their Metal Contents
author Rocha, Júlio César
author_facet Rocha, Júlio César
Sargentini, Ézio
Toscano, Ilda Antonieta Salata
Rosa, André Henrique
Burba, Peter
author_role author
author2 Sargentini, Ézio
Toscano, Ilda Antonieta Salata
Rosa, André Henrique
Burba, Peter
author2_role author
author
author
author
dc.contributor.author.fl_str_mv Rocha, Júlio César
Sargentini, Ézio
Toscano, Ilda Antonieta Salata
Rosa, André Henrique
Burba, Peter
description The aquatic humic substances investigated in this study were conventionally isolated from Rio Negro waters - Amazonas State/Brazil by means of the collector XAD 8. Molecular spectroscopy investigations of these humic substances using 1H-NMR and 13C-NMR indicated the presence of high aromaticity with few substituents, small amounts of carboxylic carbon, and an aliphatic/aromatic ratio of 1:1. The relatively high UV-VIS absorbance E350/E450 ratio suggested the presence of relatively large proportions of aliphatic structures. Moreover, using a five-stage tangential-flow ultrafiltration (UF) device, the molecular-size distribution of the isolated humic substances was characterized. The fractionation patterns showed that metal traces remaining in humic substances after their XAD 8 isolation have different size distributions. For instance, Mn, Cu, Cd and Ni quantified by ICP-AES were preferably found in the high molecular-weight fractions (10-100 kDa).
publishDate 1999
dc.date.issued.fl_str_mv 1999
dc.date.accessioned.fl_str_mv 2020-06-05T17:59:43Z
dc.date.available.fl_str_mv 2020-06-05T17:59:43Z
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 https://repositorio.inpa.gov.br/handle/1/16439
dc.identifier.doi.none.fl_str_mv 10.1590/S0103-50531999000300002
url https://repositorio.inpa.gov.br/handle/1/16439
identifier_str_mv 10.1590/S0103-50531999000300002
dc.language.iso.fl_str_mv eng
language eng
dc.relation.ispartof.pt_BR.fl_str_mv Volume 10, Número 3, Pags. 169-175
dc.rights.driver.fl_str_mv Attribution-NonCommercial-NoDerivs 3.0 Brazil
http://creativecommons.org/licenses/by-nc-nd/3.0/br/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Attribution-NonCommercial-NoDerivs 3.0 Brazil
http://creativecommons.org/licenses/by-nc-nd/3.0/br/
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Journal of the Brazilian Chemical Society
publisher.none.fl_str_mv Journal of the Brazilian Chemical Society
dc.source.none.fl_str_mv reponame:Repositório Institucional do INPA
instname:Instituto Nacional de Pesquisas da Amazônia (INPA)
instacron:INPA
instname_str Instituto Nacional de Pesquisas da Amazônia (INPA)
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institution INPA
reponame_str Repositório Institucional do INPA
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bitstream.url.fl_str_mv https://repositorio.inpa.gov.br/bitstream/1/16439/1/artigo-inpa.pdf
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repository.name.fl_str_mv Repositório Institucional do INPA - Instituto Nacional de Pesquisas da Amazônia (INPA)
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