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| - Spectroelectrochemical Microscopy: SpatiallyResolved Spectroelectrochemistry ofCarrier-Based Ion-Selective Membranes
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| - High-resolution spectroscopic imaging of the cross sectionof ion-selective membranes and the adjoining solutionphases during real-time electrochemical measurement istermed as spectroelectrochemical microscopy (SpECM).The novel SpECM instrument utilizes wavelength-dispersive multispectral imaging of a thin membrane stripseparating the two sides of a four-electrode thin-layerelectrochemical cell. SpECM is aimed as a tool foroptimizing the experimental conditions in mass transport-controlled ion-selective electrode membranes for improved detection limit. Some of the capabilities of the newtechnique are demonstrated using fix site, chromoionophore-based, pH-sensitive membranes as model systems.The experimental results are discussed in the light of theexisting theory of fixed-site membranes. The quantitativeexpression for the time-dependent change of the freeionophore concentration across the ion-selective membrane showed close correlation to the recorded concentration profiles.
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