OXIDATIVE DECOMPOSITION OF ORGANIC-WATER POLLUTANTS WITH UV-ACTIVATEDHYDROGEN-PEROXIDE - DETERMINATION OF ANIONIC PRODUCTS BY ION CHROMATOGRAPHY

Organic water pollutants are decomposed by UV-activated hydrogen perox ide. Using ion chromatography, inorganic and organic anions formed by the oxidative treatment can simultaneously be determined at trace leve ls without any sample preparation. For identification of anionic metab olites of 2,4-dichlorophenoxyacetic acid (2,4-D), 2-nitrobenzoic acid and nitrobenzene, an ion chromatographic system with a combination of two detectors based on physically different principles, conductivity a nd UV absorption, is used. Hence the anionic water components can reli ably be identified by two parameters: retention time and the concentra tion-independent specific ratio of conductivity and UV absorption resp onse.