Experimental Evidence of the Mobility of Hydroperoxyl/Superoxide Anion Radicals from the Illuminated TiO2 Interface into the Aqueous Phase

molecules, if any, can be detected as CL as a result of the reaction with MCLA. A spiral quartz cell was permitted to mix completely in front of a photomultiplier tube (PMT; Hamamatsu R-374, Shizuoka-ken, Japan). The CL signal was transferred to a data acquisition system, consisting of a signal amplifier, an analog- to-digital (A/D) converter, and a personal computer. In order to identify a reproducible CL signal, all CL measurements are performed in quintuplicate.