Adsorptive stripping chronopotentiometry (AdSCP). Part 2: Basic experimental features

Town, Raewyn M.; Leeuwen, Herman P. van

doi:10.1016/j.jelechem.2007.06.013

Cited by 6 publications

(16 citation statements)

References 35 publications

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“…In AdSCP, a ligand (L ad ) added to the solution forms with the metal ion a surface active complex (ML ad ) that is adsorbed on the electrode. 77 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.…”

Section: Stripping Chronopotentiometry (Scp)mentioning

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: Stripping Chronopotentiometry (Scp)mentioning

confidence: 99%

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

2012

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“…corresponding to the maximal transport flux of adsorbing species towards the electrode surface. In our companion paper [26] we identify the limiting values of various parameters (accumulation time, t acc ; adsorption coefficient, K H;ML ad ; bulk concentration of ML ad , c Ã ML ad ) necessary to meet the limiting flux condition, and explore details of possible deposition potential dependencies of AdSCP signals.…”

Section: Development Of the Theoretical Frameworkmentioning

confidence: 99%

“…Outside the regime where this condition is satisfied, the flux loses its constancy and C ML ad loses its linear dependence on t acc . In practical measuring situations this is essentially fatal (see [26]). These considerations also result in constraints on the s tr /s ad or s tr /t acc ratios, as detailed in [26].…”

Section: Transient Vs Steady-state Transportmentioning

confidence: 99%

“…Thus for t acc of O(10 2 ) s the transient effect is usually insignificant. The practical significance of this is illustrated in [26]. 1 O denotes order of magnitude.…”

Section: Transient Vs Steady-state Transportmentioning

confidence: 99%

“…The significance of the role of the lability of free metal ions and the related magnitude of the stability of ML ad and its associated rate constants is elaborated: this knowledge is fundamental for application of AdSCP to speciation analysis. A companion paper [26] addresses the experimental verification and further practical aspects including elementary constraints on the various parameters.…”

Section: Introductionmentioning

confidence: 99%

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