Considerations on the use of spectroelectrochemistry in reflection mode for quantitative analysis: Study of the Fe(III)/Fe(II) - orthophenanthroline system


Ustabasi G. S. , Bastos-Arrieta J., Perez-Rafols C., Serrano N., Diaz-Cruz J. M.

MICROCHEMICAL JOURNAL, vol.181, 2022 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 181
  • Publication Date: 2022
  • Doi Number: 10.1016/j.microc.2022.107678
  • Journal Name: MICROCHEMICAL JOURNAL
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, BIOSIS, CAB Abstracts, Chemical Abstracts Core, Chimica, Food Science & Technology Abstracts, Index Islamicus, Veterinary Science Database
  • Keywords: Spectroelectrochemistry, Screen-printed electrodes, Iron-orthophenanthroline complexes, Cyclic voltammetry, Chronoamperometry, Chronoabsorptometry, Iron(III) determination, SCREEN-PRINTED ELECTRODES, IONS
  • Istanbul Technical University Affiliated: Yes

Abstract

Theoretical and experimental considerations are made about possible analytical applications of spectroelectrochemistry (SEC) in reflection mode using screen-printed electrodes. The system Fe(III)/Fe(II) - orthophenanthroline is taken as a model of electrochemical generation and consumption of a substance that is strongly absorbing: the Fe(II) - orthophenanthroline complex. Different possibilities of quantification are discussed, including cathodic and anodic peaks in cyclic voltammetry and both electrochemical and optical signals acquired in chronoamperometric experiments. Among these, the evolution of absorbance with the square root of time at a constant potential has shown interesting possibilities for the determination of Fe(III)-ion at micromolar level (LOD = 2 10-6 mol L-1). Moreover, this method appears to be resistant to the presence of other electroactive species such as Cu(II)-ions.