Voltammetry of metal complex systems with different diffusion coefficients of the species involved

Jong, H.G. de; Leeuwen, Herman P. van; Holub, Karel

doi:10.1016/0022-0728(87)80158-4

Cited by 125 publications

(49 citation statements)

References 6 publications

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“…Under such conditions, the model has a solution analogous to that for the case of labile complexation in the approach by de Jong et al [2][3][4]. Indeed, the Cottrell-like expression for the peak or limiting current I lim is formally identical…”

Section: Theorymentioning

confidence: 76%

“…Moreover, in recent years, the study of metal complexation by macromolecular ligands has received especial attention due to the great importance of such ligands in environmental analysis. Among the different partial approaches to the general case, the voltammetric model of de Jong, van Leeuwen and Holub [2][3][4] appears to be especially useful, although it is restricted to the case of a unique metal ion-macromolecule complex in the absence of electrodic adsorption. In the limiting case of labile complexation, the model has been applied successfully to different metal ion-macromolecule systems (synthetic macromolecules, humic and fulvic acids, polysaccharides, etc.)…”

Section: Introductionmentioning

confidence: 98%

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Anodic Stripping Voltammetry of Metal Ions in Mixtures of Ligands

et al. 1998

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A model, originally developed for polarography of metal ions in mixtures of macromolecular and simple ligands, is extended to stripping voltammetric measurements carried out in such systems. Among other hypotheses, the model assumes excess of ligand and absence of both electrodic adsorption and kinetic effects (complexes are supposed to be totally labile or totally inert). The different hydrodynamic conditions in stripping voltammetry in respect to polarography make it necessary to modify some equations of the original model. The reliability of this semiempirical approach is tested by studying the Zn II þ polymethacrylic acid þ phthalate system, which is a typical system with labile complexation, The mean values of the formation constant and diffusion coefficient ratio obtained by this approach are quite similar to those determined from polarographic experiments. The introduction of a semiempirical hydrodynamic parameter p, analogous to that previously used in the model for a unique macromolecular complex, yields satisfactory results.

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Section: Theorymentioning

confidence: 76%

Section: Introductionmentioning

confidence: 98%

Anodic Stripping Voltammetry of Metal Ions in Mixtures of Ligands

et al. 1998

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“…For the case of excess ligand (c L >>c M + c ML ), the result in terms of the interfacial flux J M can be derived analytically [101]. The derivation shows that there are some interesting limiting cases.…”

Section: L + M → Fast Interfacial Transfermentioning

confidence: 99%

“…The underlying theory can be found in the specialized literature [100][101][102][103] and is summarized below.…”

Section: Dynamic Aspects Of Speciation Analysismentioning

confidence: 99%

Guidelines for terms related to chemical speciation and fractionation of elements. Definitions, structural aspects, and methodological approaches (IUPAC Recommendations 2000)

Templeton

Ariese

Cornelis

et al. 2000

Pure and Applied Chemistry

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814

269

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Republication or reproduction of this report or its storage and/or dissemination by electronic means isAbstract: This paper presents definitions of concepts related to speciation of elements, more particularly speciation analysis and chemical species. Fractionation is distinguished from speciation analysis, and a general outline of fractionation procedures is given. We propose a categorization of species according to isotopic composition of the element, its oxidation and electronic states, and its complex and molecular structure. Examples are given of methodological approaches used for speciation analysis. A synopsis of the methodology of dynamic speciation analysis is also presented.

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“…2 Two extreme conditions can be described: 1,6,7 (i) Complex species do not have time to dissociate/associate in the diffusion layer due to the slowness of the kinetic process and will not contribute to the signal (static system, inert complexes). In the presence of inert complexes the analytical signal (current) will be directly related to the free metal ion in the bulk solution.…”

Section: Dynamic Speciation By Electrochemicalmentioning

confidence: 99%

Electrochemical Methods for Speciation of Trace Elements in Marine Waters. Dynamic Aspects

2012

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The contribution of electrochemical methods to the knowledge of dynamic speciation of toxic trace elements in marine waters is critically reviewed. Due to the importance of dynamic considerations in the interpretation of the electrochemical signal, the principles and recent developments of kinetic features in the interconversion of metal complex species will be presented. As dynamic electrochemical methods, only stripping techniques (anodic stripping voltammetry and stripping chronopotentiometry) will be used because they are the most important for the determination of trace elements. Competitive ligand exchange-adsorptive cathodic stripping voltammetry, which should be considered an equilibrium technique rather than a dynamic method, will be also discussed because the complexing parameters may be affected by some kinetic limitations if equilibrium before analysis is not attained and/or the flux of the adsorbed complex is influenced by the lability of the natural complexes in the water sample. For a correct data interpretation and system characterization the comparison of results obtained from different techniques seems essential in the articulation of a serious discussion of their meaning.

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Voltammetry of metal complex systems with different diffusion coefficients of the species involved

Cited by 125 publications

References 6 publications

Anodic Stripping Voltammetry of Metal Ions in Mixtures of Ligands

Anodic Stripping Voltammetry of Metal Ions in Mixtures of Ligands

Guidelines for terms related to chemical speciation and fractionation of elements. Definitions, structural aspects, and methodological approaches (IUPAC Recommendations 2000)

Electrochemical Methods for Speciation of Trace Elements in Marine Waters. Dynamic Aspects

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