Voltammetry of sparingly soluble metal complexes: a differential pulse polarographic study of the Zn(II)+oxalate system

An extension of a voltammetric model for the complexation between metal ions and mixtures of ligands (either simple or macromolecular, labile or inert) is proposed for the study of the Zn(II)+oxalate system. The model considers the presence of species of low solubility that can be assumed to behave...

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Published inJournal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 475; no. 2; pp. 99 - 106
Main Authors Berbel, Francisco, Dı́az-Cruz, José Manuel, Ariño, Cristina, Esteban, Miquel
Format Journal Article
LanguageEnglish
Published Amsterdam Elsevier B.V 14.10.1999
Elsevier Science
Subjects
Chemistry
Exact sciences and technology
General and physical chemistry
Pulse polarography
Solution properties
Solutions
Voltammetry
Zn(II)+oxalate system
Zn(II)+oxalate system
Voltammetry
Pulse polarography
Electrolyte solution
Solubility product
Organic ligand
Stability constant
Transition metal Complexes
Experimental study
Cyclic voltammetry
Oxalic acid
Medium effect
Ionic strength
Concentration effect
Chemical properties
Aqueous solution
Zinc Complexes
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Summary:An extension of a voltammetric model for the complexation between metal ions and mixtures of ligands (either simple or macromolecular, labile or inert) is proposed for the study of the Zn(II)+oxalate system. The model considers the presence of species of low solubility that can be assumed to behave as soluble inert complexes. As well as the solubility problem, a loss of reversibility in the zinc reduction process occurs. This problem is overcome by increasing the effective time scale of the measurements. The application of the model to experimental data has produced reliable results, which can be used to estimate complexation constants and solubility products, as long as the irreversible processes that influence the current and potential measurement are avoided.
ISSN:1572-6657
1873-2569
DOI:10.1016/S0022-0728(99)00331-9