Propriedades ácido-base e de complexação de ácidos húmico e fúlvico isolados de vermicomposto
Autor(a) principal: | |
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Data de Publicação: | 2007 |
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=S0100-40422007000500039 |
Resumo: | Proton binding properties of humic and fulvic acids were studied by potentiometric titration. Carboxylic groups were the predominant ionizable sites in comparison to phenolic and amine groups. Total acidity of fulvic acid was 12 x 10-3 mol g-1, a number significantly higher than that obtained for humic acid (5.2 x 10-3 mol g-1). Copper ion binding was evaluated at pH 4, 5 and 6 by potentiometric titration with an ion selective electrode for Cu(II). Differential stability constants and complexation capacities were systematically higher for humic acid, despite its lower number of ionizable sites in comparison with fulvic acid. |
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Propriedades ácido-base e de complexação de ácidos húmico e fúlvico isolados de vermicompostohumic substancesproton bindingcomplexationProton binding properties of humic and fulvic acids were studied by potentiometric titration. Carboxylic groups were the predominant ionizable sites in comparison to phenolic and amine groups. Total acidity of fulvic acid was 12 x 10-3 mol g-1, a number significantly higher than that obtained for humic acid (5.2 x 10-3 mol g-1). Copper ion binding was evaluated at pH 4, 5 and 6 by potentiometric titration with an ion selective electrode for Cu(II). Differential stability constants and complexation capacities were systematically higher for humic acid, despite its lower number of ionizable sites in comparison with fulvic acid.Sociedade Brasileira de Química2007-10-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422007000500039Química Nova v.30 n.5 2007reponame:Química Nova (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0100-40422007000500039info:eu-repo/semantics/openAccessColombo,Sandro de MirandaSantos,Luciana Bagdeve de Oliveira dosMasini,Jorge CesarAbate,Gilbertopor2007-09-28T00:00:00Zoai:scielo:S0100-40422007000500039Revistahttps://www.scielo.br/j/qn/ONGhttps://old.scielo.br/oai/scielo-oai.phpquimicanova@sbq.org.br1678-70640100-4042opendoar:2007-09-28T00:00Química Nova (Online) - Sociedade Brasileira de Química (SBQ)false |
dc.title.none.fl_str_mv |
Propriedades ácido-base e de complexação de ácidos húmico e fúlvico isolados de vermicomposto |
title |
Propriedades ácido-base e de complexação de ácidos húmico e fúlvico isolados de vermicomposto |
spellingShingle |
Propriedades ácido-base e de complexação de ácidos húmico e fúlvico isolados de vermicomposto Colombo,Sandro de Miranda humic substances proton binding complexation |
title_short |
Propriedades ácido-base e de complexação de ácidos húmico e fúlvico isolados de vermicomposto |
title_full |
Propriedades ácido-base e de complexação de ácidos húmico e fúlvico isolados de vermicomposto |
title_fullStr |
Propriedades ácido-base e de complexação de ácidos húmico e fúlvico isolados de vermicomposto |
title_full_unstemmed |
Propriedades ácido-base e de complexação de ácidos húmico e fúlvico isolados de vermicomposto |
title_sort |
Propriedades ácido-base e de complexação de ácidos húmico e fúlvico isolados de vermicomposto |
author |
Colombo,Sandro de Miranda |
author_facet |
Colombo,Sandro de Miranda Santos,Luciana Bagdeve de Oliveira dos Masini,Jorge Cesar Abate,Gilberto |
author_role |
author |
author2 |
Santos,Luciana Bagdeve de Oliveira dos Masini,Jorge Cesar Abate,Gilberto |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Colombo,Sandro de Miranda Santos,Luciana Bagdeve de Oliveira dos Masini,Jorge Cesar Abate,Gilberto |
dc.subject.por.fl_str_mv |
humic substances proton binding complexation |
topic |
humic substances proton binding complexation |
description |
Proton binding properties of humic and fulvic acids were studied by potentiometric titration. Carboxylic groups were the predominant ionizable sites in comparison to phenolic and amine groups. Total acidity of fulvic acid was 12 x 10-3 mol g-1, a number significantly higher than that obtained for humic acid (5.2 x 10-3 mol g-1). Copper ion binding was evaluated at pH 4, 5 and 6 by potentiometric titration with an ion selective electrode for Cu(II). Differential stability constants and complexation capacities were systematically higher for humic acid, despite its lower number of ionizable sites in comparison with fulvic acid. |
publishDate |
2007 |
dc.date.none.fl_str_mv |
2007-10-01 |
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=S0100-40422007000500039 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40422007000500039 |
dc.language.iso.fl_str_mv |
por |
language |
por |
dc.relation.none.fl_str_mv |
10.1590/S0100-40422007000500039 |
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.30 n.5 2007 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_ |
1750318106538934272 |