Utilização de eletrodos potenciométricos de amálgama em estudos de complexação de substâncias húmicas

Detalhes bibliográficos
Autor(a) principal: Abate,Gilberto
Data de Publicação: 1999
Outros Autores: Masini,Jorge C.
Tipo de documento: Artigo
Idioma: por
Título da fonte: Química Nova (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421999000500006
Resumo: Potentiometric amalgam electrodes of lead, cadmium, and zinc are proposed to study the complexation properties of commercial and river sediment humic acids. The copper complexation properties of both humic acids were studied in parallel using the solid membrane copper ion-selective electrode (Cu-ISE). The complexing capacity and the averaged conditional stability constants were determined at pH 6.00 ± 0.05 in medium of 2x10-2 mol L-1 sodium nitrate, using the Scatchard method. The lead and cadmium amalgam electrodes presented a Nernstian behavior from 1x10-5 to 1x10-3 moles L-1 of total metal concentration, permitting to perform the complexation studies using humic acid concentrations around of 20 to 30 mg L-1, that avoids colloidal aggregation. The zinc amalgam electrode showed a subnernstian linear response in the same range of metal concentrations. The Scatchard graphs for both humic acids suggested two classes of binding sites for lead and copper and one class of binding site for zinc and cadmium.
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spelling Utilização de eletrodos potenciométricos de amálgama em estudos de complexação de substâncias húmicaspotentiometryamalgam electrodescomplexationhumic substancesPotentiometric amalgam electrodes of lead, cadmium, and zinc are proposed to study the complexation properties of commercial and river sediment humic acids. The copper complexation properties of both humic acids were studied in parallel using the solid membrane copper ion-selective electrode (Cu-ISE). The complexing capacity and the averaged conditional stability constants were determined at pH 6.00 ± 0.05 in medium of 2x10-2 mol L-1 sodium nitrate, using the Scatchard method. The lead and cadmium amalgam electrodes presented a Nernstian behavior from 1x10-5 to 1x10-3 moles L-1 of total metal concentration, permitting to perform the complexation studies using humic acid concentrations around of 20 to 30 mg L-1, that avoids colloidal aggregation. The zinc amalgam electrode showed a subnernstian linear response in the same range of metal concentrations. The Scatchard graphs for both humic acids suggested two classes of binding sites for lead and copper and one class of binding site for zinc and cadmium.Sociedade Brasileira de Química1999-09-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421999000500006Química Nova v.22 n.5 1999reponame:Química Nova (Online)instname:Sociedade Brasileira de Química (SBQ)instacron:SBQ10.1590/S0100-40421999000500006info:eu-repo/semantics/openAccessAbate,GilbertoMasini,Jorge C.por2000-02-04T00:00:00Zoai:scielo:S0100-40421999000500006Revistahttps://www.scielo.br/j/qn/ONGhttps://old.scielo.br/oai/scielo-oai.phpquimicanova@sbq.org.br1678-70640100-4042opendoar:2000-02-04T00:00Química Nova (Online) - Sociedade Brasileira de Química (SBQ)false
dc.title.none.fl_str_mv Utilização de eletrodos potenciométricos de amálgama em estudos de complexação de substâncias húmicas
title Utilização de eletrodos potenciométricos de amálgama em estudos de complexação de substâncias húmicas
spellingShingle Utilização de eletrodos potenciométricos de amálgama em estudos de complexação de substâncias húmicas
Abate,Gilberto
potentiometry
amalgam electrodes
complexation
humic substances
title_short Utilização de eletrodos potenciométricos de amálgama em estudos de complexação de substâncias húmicas
title_full Utilização de eletrodos potenciométricos de amálgama em estudos de complexação de substâncias húmicas
title_fullStr Utilização de eletrodos potenciométricos de amálgama em estudos de complexação de substâncias húmicas
title_full_unstemmed Utilização de eletrodos potenciométricos de amálgama em estudos de complexação de substâncias húmicas
title_sort Utilização de eletrodos potenciométricos de amálgama em estudos de complexação de substâncias húmicas
author Abate,Gilberto
author_facet Abate,Gilberto
Masini,Jorge C.
author_role author
author2 Masini,Jorge C.
author2_role author
dc.contributor.author.fl_str_mv Abate,Gilberto
Masini,Jorge C.
dc.subject.por.fl_str_mv potentiometry
amalgam electrodes
complexation
humic substances
topic potentiometry
amalgam electrodes
complexation
humic substances
description Potentiometric amalgam electrodes of lead, cadmium, and zinc are proposed to study the complexation properties of commercial and river sediment humic acids. The copper complexation properties of both humic acids were studied in parallel using the solid membrane copper ion-selective electrode (Cu-ISE). The complexing capacity and the averaged conditional stability constants were determined at pH 6.00 ± 0.05 in medium of 2x10-2 mol L-1 sodium nitrate, using the Scatchard method. The lead and cadmium amalgam electrodes presented a Nernstian behavior from 1x10-5 to 1x10-3 moles L-1 of total metal concentration, permitting to perform the complexation studies using humic acid concentrations around of 20 to 30 mg L-1, that avoids colloidal aggregation. The zinc amalgam electrode showed a subnernstian linear response in the same range of metal concentrations. The Scatchard graphs for both humic acids suggested two classes of binding sites for lead and copper and one class of binding site for zinc and cadmium.
publishDate 1999
dc.date.none.fl_str_mv 1999-09-01
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=S0100-40421999000500006
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0100-40421999000500006
dc.language.iso.fl_str_mv por
language por
dc.relation.none.fl_str_mv 10.1590/S0100-40421999000500006
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.22 n.5 1999
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
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