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Electrogenerated Chemiluminescence for Potentiometric Sensors

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journal contribution
posted on 22.02.2016, 09:17 by Gastón A. Crespo, Günter Mistlberger, Eric Bakker
We report here on a generic approach to read out potentiometric sensors with electrogenerated chemiluminescence (ECL). In a first example, a potassium ion-selective electrode acts as the reference electrode and is placed in contact with the sample solution. The working electrode of the three-electrode cell is responsible for ECL generation and placed in a detection solution containing tris­(2,2′-bipyridyl)­ruthenium­(II) [Ru­(bpy)32+] and the coreactant 2-(dibutylamino)­ethanol (DBAE), physically separated from the sample by a bridge. Changes in the sample potassium concentration directly modulate the potential at the working electrode, and hence the ECL output, when a constant-potential pulse is applied between the two electrodes. A linear response of the ECL intensity to the logarithmic potassium concentration between 10 μm and 10 mM was found.