Frações da matéria orgânica e propriedades redox de substâncias húmicas em sedimentos de oceanos profundos
Autor(a) principal: | |
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Data de Publicação: | 2013 |
Outros Autores: | , , , |
Tipo de documento: | Artigo |
Idioma: | por |
Título da fonte: | Química Nova (Online) |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422013000900003 |
Resumo: | Previous studies have verified that free radicals such as quinone moieties in organic matter participate in the redox reactions in natural systems. These functional groups were positively correlated with the increase in aromaticity and hydrophobicity of the humic substances. As an alternative to relatively complex and expensive spectroscopic methods, the redox properties of the humic substances, determined by potentiometric titrations, have been used to evaluate organic carbon stability in soil and sediments. The present study aimed to perform organic matter fractionation and isolation of humic substances from deep oceans in different isobaths (750; 1,050; 1,350; 1,650; 1,950 m) to determine their redox properties by iodimetric titrations under an inert atmosphere and specified conditions of pH and ionic strength. Sediment samples were collected to the North and South of platforms of petroleum exploration located in the North of Rio de Janeiro State, Brazil. Fractions of organic carbon and redox properties of humic substances varied with origin and depth of the samples and with position North and South of the petroleum exploration area. |
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Frações da matéria orgânica e propriedades redox de substâncias húmicas em sedimentos de oceanos profundossedimentsorganic carbonelectrochemistryPrevious studies have verified that free radicals such as quinone moieties in organic matter participate in the redox reactions in natural systems. These functional groups were positively correlated with the increase in aromaticity and hydrophobicity of the humic substances. As an alternative to relatively complex and expensive spectroscopic methods, the redox properties of the humic substances, determined by potentiometric titrations, have been used to evaluate organic carbon stability in soil and sediments. The present study aimed to perform organic matter fractionation and isolation of humic substances from deep oceans in different isobaths (750; 1,050; 1,350; 1,650; 1,950 m) to determine their redox properties by iodimetric titrations under an inert atmosphere and specified conditions of pH and ionic strength. Sediment samples were collected to the North and South of platforms of petroleum exploration located in the North of Rio de Janeiro State, Brazil. Fractions of organic carbon and redox properties of humic substances varied with origin and depth of the samples and with position North and South of the petroleum exploration area.Sociedade Brasileira de Química2013-01-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422013000900003Química Nova v.36 n.9 2013reponame:Química Nova (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0100-40422013000900003info:eu-repo/semantics/openAccessBaldotto,Marihus AltoéGobo,Arizoli Antonio RosaSalomão,Marcos Sarmet Moreira de BarrosRezende,Carlos EduardoCamargo,Plínio Barbosa depor2013-11-12T00:00:00Zoai:scielo:S0100-40422013000900003Revistahttps://www.scielo.br/j/qn/ONGhttps://old.scielo.br/oai/scielo-oai.phpquimicanova@sbq.org.br1678-70640100-4042opendoar:2013-11-12T00:00Química Nova (Online) - Sociedade Brasileira de Química (SBQ)false |
dc.title.none.fl_str_mv |
Frações da matéria orgânica e propriedades redox de substâncias húmicas em sedimentos de oceanos profundos |
title |
Frações da matéria orgânica e propriedades redox de substâncias húmicas em sedimentos de oceanos profundos |
spellingShingle |
Frações da matéria orgânica e propriedades redox de substâncias húmicas em sedimentos de oceanos profundos Baldotto,Marihus Altoé sediments organic carbon electrochemistry |
title_short |
Frações da matéria orgânica e propriedades redox de substâncias húmicas em sedimentos de oceanos profundos |
title_full |
Frações da matéria orgânica e propriedades redox de substâncias húmicas em sedimentos de oceanos profundos |
title_fullStr |
Frações da matéria orgânica e propriedades redox de substâncias húmicas em sedimentos de oceanos profundos |
title_full_unstemmed |
Frações da matéria orgânica e propriedades redox de substâncias húmicas em sedimentos de oceanos profundos |
title_sort |
Frações da matéria orgânica e propriedades redox de substâncias húmicas em sedimentos de oceanos profundos |
author |
Baldotto,Marihus Altoé |
author_facet |
Baldotto,Marihus Altoé Gobo,Arizoli Antonio Rosa Salomão,Marcos Sarmet Moreira de Barros Rezende,Carlos Eduardo Camargo,Plínio Barbosa de |
author_role |
author |
author2 |
Gobo,Arizoli Antonio Rosa Salomão,Marcos Sarmet Moreira de Barros Rezende,Carlos Eduardo Camargo,Plínio Barbosa de |
author2_role |
author author author author |
dc.contributor.author.fl_str_mv |
Baldotto,Marihus Altoé Gobo,Arizoli Antonio Rosa Salomão,Marcos Sarmet Moreira de Barros Rezende,Carlos Eduardo Camargo,Plínio Barbosa de |
dc.subject.por.fl_str_mv |
sediments organic carbon electrochemistry |
topic |
sediments organic carbon electrochemistry |
description |
Previous studies have verified that free radicals such as quinone moieties in organic matter participate in the redox reactions in natural systems. These functional groups were positively correlated with the increase in aromaticity and hydrophobicity of the humic substances. As an alternative to relatively complex and expensive spectroscopic methods, the redox properties of the humic substances, determined by potentiometric titrations, have been used to evaluate organic carbon stability in soil and sediments. The present study aimed to perform organic matter fractionation and isolation of humic substances from deep oceans in different isobaths (750; 1,050; 1,350; 1,650; 1,950 m) to determine their redox properties by iodimetric titrations under an inert atmosphere and specified conditions of pH and ionic strength. Sediment samples were collected to the North and South of platforms of petroleum exploration located in the North of Rio de Janeiro State, Brazil. Fractions of organic carbon and redox properties of humic substances varied with origin and depth of the samples and with position North and South of the petroleum exploration area. |
publishDate |
2013 |
dc.date.none.fl_str_mv |
2013-01-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422013000900003 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422013000900003 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
10.1590/S0100-40422013000900003 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
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 |
Química Nova v.36 n.9 2013 reponame:Química Nova (Online) instname:Sociedade Brasileira de Química (SBQ) instacron:SBQ |
instname_str |
Sociedade Brasileira de Química (SBQ) |
instacron_str |
SBQ |
institution |
SBQ |
reponame_str |
Química Nova (Online) |
collection |
Química Nova (Online) |
repository.name.fl_str_mv |
Química Nova (Online) - Sociedade Brasileira de Química (SBQ) |
repository.mail.fl_str_mv |
quimicanova@sbq.org.br |
_version_ |
1750318115137257472 |