APPLICATION OF CHEMICAL IMAGING SENSOR TO ELECTRO GENERATED PH DISTRIBUTION

The scanning-laser-beam chemical imaging sensor was applied for the ob servation of electrogenerated pH distribution on a mesoscopic scale. E lectrolysis was carried out in potassium chloride solution and the res ulting pH distribution was imaged with a 0.2 mm spatial resolution. As a result, the generation of the pH distribution and its expansion to the bulk region were clearly imaged. By examining the pH image, it was also possible to obtain the pH values in the pH-distributed regions s eparately from those in the bulk region.