Stripping chronopotentiometry at scanned deposition potential (SSCP)

An effective methodology for dynamic speciation analysis of nanoparticulate metal complexes

Raewyn M. Town*, Herman P. van Leeuwen

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

Abstract

The features of stripping chronopotentiometry at scanned deposition potential (SSCP) are reviewed and placed in context with voltammetric and other dynamic speciation techniques. The advantages of SSCP for speciation analysis of nanoparticulate metal complexes are highlighted. Analogous to other electrochemical techniques, the SSCP wave is rich in information: the measurements from the foot to the plateau of the wave access the relevant parts of the stability distribution and the rate constant distributions. The complete depletion regime of SSCP offers particular advantages due to its ability to unambiguously distinguish between various factors that can confound interpretation of data from other electroanalytical methods, including electrochemical irreversibility, kinetically controlled currents, reduced diffusion coefficient of the metal complex species as compared to the free metal ion, and chemical heterogeneity in the intrinsic binding affinity.

Original languageEnglish
Article number113530
JournalJournal of Electroanalytical Chemistry
Volume853
DOIs
Publication statusPublished - 15 Nov 2019

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Coordination Complexes
Metal complexes
Metal ions
Rate constants

Keywords

  • Chemical heterogeneity
  • Dynamic metal speciation
  • Humic substances
  • Lability
  • Nanoparticulate complexants

Cite this

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title = "Stripping chronopotentiometry at scanned deposition potential (SSCP): An effective methodology for dynamic speciation analysis of nanoparticulate metal complexes",
abstract = "The features of stripping chronopotentiometry at scanned deposition potential (SSCP) are reviewed and placed in context with voltammetric and other dynamic speciation techniques. The advantages of SSCP for speciation analysis of nanoparticulate metal complexes are highlighted. Analogous to other electrochemical techniques, the SSCP wave is rich in information: the measurements from the foot to the plateau of the wave access the relevant parts of the stability distribution and the rate constant distributions. The complete depletion regime of SSCP offers particular advantages due to its ability to unambiguously distinguish between various factors that can confound interpretation of data from other electroanalytical methods, including electrochemical irreversibility, kinetically controlled currents, reduced diffusion coefficient of the metal complex species as compared to the free metal ion, and chemical heterogeneity in the intrinsic binding affinity.",
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author = "Town, {Raewyn M.} and {van Leeuwen}, {Herman P.}",
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T2 - An effective methodology for dynamic speciation analysis of nanoparticulate metal complexes

AU - Town, Raewyn M.

AU - van Leeuwen, Herman P.

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AB - The features of stripping chronopotentiometry at scanned deposition potential (SSCP) are reviewed and placed in context with voltammetric and other dynamic speciation techniques. The advantages of SSCP for speciation analysis of nanoparticulate metal complexes are highlighted. Analogous to other electrochemical techniques, the SSCP wave is rich in information: the measurements from the foot to the plateau of the wave access the relevant parts of the stability distribution and the rate constant distributions. The complete depletion regime of SSCP offers particular advantages due to its ability to unambiguously distinguish between various factors that can confound interpretation of data from other electroanalytical methods, including electrochemical irreversibility, kinetically controlled currents, reduced diffusion coefficient of the metal complex species as compared to the free metal ion, and chemical heterogeneity in the intrinsic binding affinity.

KW - Chemical heterogeneity

KW - Dynamic metal speciation

KW - Humic substances

KW - Lability

KW - Nanoparticulate complexants

U2 - 10.1016/j.jelechem.2019.113530

DO - 10.1016/j.jelechem.2019.113530

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VL - 853

JO - Journal of Electroanalytical Chemistry

JF - Journal of Electroanalytical Chemistry

SN - 1572-6657

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