Electrochemical analyses of redox-active iron minerals

A review of nonmediated and mediated approaches

Michael Sander, Thomas B. Hofstetter, Christopher Aaron Gorski

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

Redox-active minerals are ubiquitous in the environment and are involved in numerous electron transfer reactions that significantly affect biogeochemical processes and cycles as well as pollutant dynamics. As a consequence, research in different scientific disciplines is devoted to elucidating the redox properties and reactivities of minerals. This review focuses on the characterization of mineral redox properties using electrochemical approaches from an applied (bio)geochemical and environmental analytical chemistry perspective. Establishing redox equilibria between the minerals and working electrodes is a major challenge in electrochemical measurements, which we discuss in an overview of traditional electrochemical techniques. These issues can be overcome with mediated electrochemical analyses in which dissolved redox mediators are used to increase the rate of electron transfer and to facilitate redox equilibration between working electrodes and minerals in both amperometric and potentiometric measurements. Using experimental data on an iron-bearing clay mineral, we illustrate how mediated electrochemical analyses can be employed to derive important thermodynamic and kinetic data on electron transfer to and from structural iron. We summarize anticipated methodological advancements that will further contribute to advance an improved understanding of electron transfer to and from minerals in environmentally relevant redox processes.

Original languageEnglish (US)
Pages (from-to)5862-5878
Number of pages17
JournalEnvironmental Science and Technology
Volume49
Issue number10
DOIs
StatePublished - May 19 2015

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Minerals
Iron
iron
mineral
electron
Electrons
electrode
Bearings (structural)
Electrodes
clay mineral
Oxidation-Reduction
Clay minerals
Electrochemical properties
thermodynamics
kinetics
Thermodynamics
pollutant
Kinetics
Chemical analysis

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Environmental Chemistry

Cite this

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Electrochemical analyses of redox-active iron minerals : A review of nonmediated and mediated approaches. / Sander, Michael; Hofstetter, Thomas B.; Gorski, Christopher Aaron.

In: Environmental Science and Technology, Vol. 49, No. 10, 19.05.2015, p. 5862-5878.

Research output: Contribution to journalArticle

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