Dynamic Modelling of Nickel Complexation in Xylem Sap of Quercus ilex: A Voltammetric Study
Autor(a) principal: | |
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Data de Publicação: | 2006 |
Outros Autores: | , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10316/8144 https://doi.org/10.1002/elan.200503446 |
Resumo: | Holm oak (Quercus ilex) is the dominant tree growing on serpentine soils of northeast Portugal, characterized by elevated soil concentrations of Ni and Mg, combined with low Ca concentrations. Apparently Q. ilex does not suffer from excessive concentrations of Ni in the soil. In this work we report a complexation study of nickel by the relevant ligands present in xylem sap: histidine, aspartic acid, oxalic and citric acids, at 0.10 M ionic strength and pH 5.5. Single and mixed complexes were characterized. To validate the proposed complexation model, diluted solutions of Q. ilex xylem sap were titrated with nickel. All studies were done using square-wave voltammetry (SWV) at a hanging mercury drop electrode. Due to the dynamic nature of SWV, it is possible to obtain the conditional stability constants of the complexes formed but also to have knowledge on the kinetics of the interconversion of the species present. |
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Dynamic Modelling of Nickel Complexation in Xylem Sap of Quercus ilex: A Voltammetric StudyHolm oak (Quercus ilex) is the dominant tree growing on serpentine soils of northeast Portugal, characterized by elevated soil concentrations of Ni and Mg, combined with low Ca concentrations. Apparently Q. ilex does not suffer from excessive concentrations of Ni in the soil. In this work we report a complexation study of nickel by the relevant ligands present in xylem sap: histidine, aspartic acid, oxalic and citric acids, at 0.10 M ionic strength and pH 5.5. Single and mixed complexes were characterized. To validate the proposed complexation model, diluted solutions of Q. ilex xylem sap were titrated with nickel. All studies were done using square-wave voltammetry (SWV) at a hanging mercury drop electrode. Due to the dynamic nature of SWV, it is possible to obtain the conditional stability constants of the complexes formed but also to have knowledge on the kinetics of the interconversion of the species present.2006info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articlehttp://hdl.handle.net/10316/8144http://hdl.handle.net/10316/8144https://doi.org/10.1002/elan.200503446engElectroanalysis. 18:8 (2006) 814-822Santos, Margarida Maria Correia dosAlves, SheilaGonçalves, Maria de Lurdes SimõesNabais, Cristinainfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2019-05-28T14:32:35Zoai:estudogeral.uc.pt:10316/8144Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:55:51.972425Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
Dynamic Modelling of Nickel Complexation in Xylem Sap of Quercus ilex: A Voltammetric Study |
title |
Dynamic Modelling of Nickel Complexation in Xylem Sap of Quercus ilex: A Voltammetric Study |
spellingShingle |
Dynamic Modelling of Nickel Complexation in Xylem Sap of Quercus ilex: A Voltammetric Study Santos, Margarida Maria Correia dos |
title_short |
Dynamic Modelling of Nickel Complexation in Xylem Sap of Quercus ilex: A Voltammetric Study |
title_full |
Dynamic Modelling of Nickel Complexation in Xylem Sap of Quercus ilex: A Voltammetric Study |
title_fullStr |
Dynamic Modelling of Nickel Complexation in Xylem Sap of Quercus ilex: A Voltammetric Study |
title_full_unstemmed |
Dynamic Modelling of Nickel Complexation in Xylem Sap of Quercus ilex: A Voltammetric Study |
title_sort |
Dynamic Modelling of Nickel Complexation in Xylem Sap of Quercus ilex: A Voltammetric Study |
author |
Santos, Margarida Maria Correia dos |
author_facet |
Santos, Margarida Maria Correia dos Alves, Sheila Gonçalves, Maria de Lurdes Simões Nabais, Cristina |
author_role |
author |
author2 |
Alves, Sheila Gonçalves, Maria de Lurdes Simões Nabais, Cristina |
author2_role |
author author author |
dc.contributor.author.fl_str_mv |
Santos, Margarida Maria Correia dos Alves, Sheila Gonçalves, Maria de Lurdes Simões Nabais, Cristina |
description |
Holm oak (Quercus ilex) is the dominant tree growing on serpentine soils of northeast Portugal, characterized by elevated soil concentrations of Ni and Mg, combined with low Ca concentrations. Apparently Q. ilex does not suffer from excessive concentrations of Ni in the soil. In this work we report a complexation study of nickel by the relevant ligands present in xylem sap: histidine, aspartic acid, oxalic and citric acids, at 0.10 M ionic strength and pH 5.5. Single and mixed complexes were characterized. To validate the proposed complexation model, diluted solutions of Q. ilex xylem sap were titrated with nickel. All studies were done using square-wave voltammetry (SWV) at a hanging mercury drop electrode. Due to the dynamic nature of SWV, it is possible to obtain the conditional stability constants of the complexes formed but also to have knowledge on the kinetics of the interconversion of the species present. |
publishDate |
2006 |
dc.date.none.fl_str_mv |
2006 |
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://hdl.handle.net/10316/8144 http://hdl.handle.net/10316/8144 https://doi.org/10.1002/elan.200503446 |
url |
http://hdl.handle.net/10316/8144 https://doi.org/10.1002/elan.200503446 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
Electroanalysis. 18:8 (2006) 814-822 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
instacron_str |
RCAAP |
institution |
RCAAP |
reponame_str |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
collection |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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