Emission Intensity Readout of Ion-Selective Electrodes Operating under an Electrochemical Trigger.

Katarzyna Węgrzyn,Krzysztof Maksymiuk,Agata Michalska,Justyna Kalisz,Emilia Stelmach

doi:10.1021/acs.analchem.1c00857

Katarzyna Węgrzyn, Krzysztof Maksymiuk + Show 3 more

Open Access

https://doi.org/10.1021/acs.analchem.1c00857

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Journal: Analytical Chemistry	Publication Date: Jul 15, 2021
Citations: 14	License type: CC BY 4.0

Affiliation: University of Warsaw

Abstract

We report for the first time on in situ transduction of electrochemical responses of ion-selective electrodes, operating under non-zero-current conditions, to emission change signals. The proposed novel-type PVC-based membrane comprises a dispersed redox and emission active ion-to-electron transducer. The electrochemical trigger applied induces a redox process of the transducer, inducing ion exchange between the membrane and the solution, resulting also in change of its emission spectrum. It is shown that electrochemical signals recorded for ion-selective electrodes operating under voltammetric/coulometric conditions correlate with emission intensity changes recorded in the same experiments. Moreover, the proposed optical readout offers extended linear response range compared to electrical signals recorded in voltammetric or coulometric mode.

Highlights

We report for the first time on in situ transduction of electrochemical responses of ion-selective electrodes, operating under non-zero-current conditions, to emission change signals
An electrochemical trigger induces a redox process in the transducer, ion exchange with the Ion-selective membranes (ISMs), ion transport in the phase, and ion exchange on the ISM−sample interface
The emission mode is highly sensitive to polymer redox state changes,[13,15] offering the possibility of optical readout of processes occurring in systems operating under an electrochemical trigger, an approach yet not explored to our best knowledge

Summary

Introduction

We report for the first time on in situ transduction of electrochemical responses of ion-selective electrodes, operating under non-zero-current conditions, to emission change signals. The novel idea of this work is to explore the emission change of POT corresponding to the redox transition of the polymer dispersed within the ISM forced by an applied trigger as a signal of an electrochemical reaction occurring (Figure 1).

Results

Conclusion