title: Spectroelectrochemical microscopy: spatially resolved spectroelectrochemistry of carrier-based ion-selective membranes.
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.
authors.affiliation: Institute of General and Analytical Chemistry, Budapest University of Technology and Economics, Szt. Gellért tér 4, Budapest, Hungary-1111.
authors.forename: Róbert E
authors.initials: RE
authors.lastname: Gyurcsányi
authors.forename: Ernö
authors.initials: E
authors.lastname: Lindner