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Title
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Dynamic features of speciation analysis by adsorptive stripping techniques
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Author
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Abstract
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| 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 ML(ad) towards the electrode may be modified by the coupled conversions of ML and M into ML(ad). An immediate consequence is that the accumulation flux of ML(ad) can be greater than that corresponding to its mere bulk concentration: a labile ML contributes fully to the ML(ad) accumulation, and a further flux enhancement can arise if ML is more mobile than ML(ad) (D(ML) > D(MLad)). 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 ML(ad). 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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Language
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English
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Source (journal)
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Environmental chemistry
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Publication
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2010
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DOI
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10.1071/EN10027
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Volume/pages
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7
:3
(2010)
, p. 242-249
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ISI
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000278974000004
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Full text (Publisher's DOI)
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