Spectroelectrochemical microscopy: Spatially resolved spectroelectrochemistry of carrier-based ion-selective membranes

Róbert E. Gyurcsányi, Ernö Lindner

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Abstract

High-resolution spectroscopic imaging of the cross section of ion-selective membranes and the adjoining solution phases during real-time electrochemical measurement is termed as spectroelectrochemical microscopy (SpECM). The novel SpECM instrument utilizes wavelength-dispersive multispectral imaging of a thin membrane strip separating the two sides of a four-electrode thin-layer electrochemical cell. SpECM is aimed as a tool for optimizing the experimental conditions in mass transport-controlled ion-selective electrode membranes for improved detection limit. Some of the capabilities of the new technique are demonstrated using fix site, chromoionophore-based, pH-sensitive membranes as model systems. The experimental results are discussed in the light of the existing theory of fixed-site membranes. The quantitative expression for the time-dependent change of the free ionophore concentration across the ion-selective membrane showed close correlation to the recorded concentration profiles.

Original languageEnglish
Pages (from-to)2132-2139
Number of pages8
JournalAnalytical Chemistry
Volume77
Issue number7
DOIs
Publication statusPublished - Apr 1 2005

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ASJC Scopus subject areas

  • Analytical Chemistry

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