UV-OXIDATION OF ORGANIC POLLUTANTS IN WATER BY USING EXCIMER-LASER RADIATION

The digestion of fulvate and 2,4-dichlorophenol by means of an excimer laser was investigated in dependence on the wavelength (308 nm, 248 n m, 193 nm) and the irradiation dose. The decomposition rate increased with increasing irradiation dose and shorter wavelengths. Compared wit h the energy dose necessary for the digestion of 1 mg of fulvate in aq ueous solution by means of a mercury high pressure lamp, the energy do se for laser digestion in particular at 193 nm and 248 nm was much low er. Thus the excimer laser could be developed to a powerful tool for U V oxidation not only for sample preparation in voltammetry but also fo r water cleaning.