Adsorptive stripping chronopotentiometry (AdSCP). Part 3: Multi-metal systems

Town, Raewyn M.

doi:10.1016/j.jelechem.2009.10.001

Cited by 3 publications

(1 citation statement)

References 32 publications

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“…The metal ion is, then, quantified by the application of a reducing constant current. The theory underlying this technique has been developed very recently, and it was shown that a single adsorptive stripping measurement is only feasible under rather restrictive conditions . No applications of AdSCP to marine waters have been found yet.…”

Section: Dynamic Speciation By Electrochemical Methodsmentioning

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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Section: Dynamic Speciation By Electrochemical Methodsmentioning

confidence: 99%

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

2012

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The Chronopotentiometric Stripping Analysis of Lead Based on Abrasively Immobilized Multi-walled Carbon Nanotubes Bismuth Film Electrode

Xiong

et al. 2014

International Journal of Electrochemical Science

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Dynamic features of speciation analysis by adsorptive stripping techniques

Town

Leeuwen

2010

Environ. Chem.

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Environmental context.The environmental fate and bioavailability of metal ions in natural waters is determined by their thermodynamic stability and kinetic features, both of which are distributed. Competing ligand exchange – adsorptive stripping (CLE-AdS) is a technique that measures a certain portion of these complexes as determined by the stability of the selected competing ligand and the dynamic features of the sample complexes that remain following ligand exchange. Exploitation of CLE-AdS to determine a spectrum of sample complexes requires insight into its thermodynamic and kinetic windows. Abstract.The kinetic features of the accumulation step of competing ligand exchange – adsorptive stripping (CLE-AdS) in metal speciation methodology are elaborated. During the adsorptive accumulation process, the flux of the surface active complex MLad towards the electrode may be modified by the coupled conversions of ML and M into MLad. An immediate consequence is that the accumulation flux of MLad can be greater than that corresponding to its mere bulk concentration: a labile ML contributes fully to the MLad accumulation, and a further flux enhancement can arise if ML is more mobile than MLad (DML > DMLad). Applying the conventional lability criterion, we present a framework for interpretation of CLE-AdS measurements in the presence of kinetic contributions from sample ML to the adsorptive accumulation of MLad. Measured accumulation fluxes for a kinetic case are well described by the presented theoretical framework. The dynamic analysis provides the basis for exploitation of CLE-AdS over a wider kinetic window than has been used to date. Consideration of the dynamics of sample species during the adsorptive accumulation step is fundamental for interpretation of metal speciation by CLE-AdS in complex natural systems that contain a distribution of complexes of different stability, lability, and mobility.

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Adsorptive stripping chronopotentiometry (AdSCP). Part 3: Multi-metal systems

Cited by 3 publications

References 32 publications

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

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

The Chronopotentiometric Stripping Analysis of Lead Based on Abrasively Immobilized Multi-walled Carbon Nanotubes Bismuth Film Electrode

Dynamic features of speciation analysis by adsorptive stripping techniques

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