Please use this identifier to cite or link to this item: http://hdl.handle.net/10316/8144
Title: Dynamic Modelling of Nickel Complexation in Xylem Sap of Quercus ilex: A Voltammetric Study
Authors: Santos, Margarida Maria Correia dos 
Alves, Sheila 
Gonçalves, Maria de Lurdes Simões 
Nabais, Cristina 
Issue Date: 2006
Citation: Electroanalysis. 18:8 (2006) 814-822
Abstract: 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.
URI: http://hdl.handle.net/10316/8144
DOI: 10.1002/elan.200503446
Rights: openAccess
Appears in Collections:FCTUC Ciências da Vida - Artigos em Revistas Internacionais

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