FREE-RADICALS FORMATION INDUCED BY THE OZONATION OF HUMIC SUBSTANCES IN AQUEOUS-MEDIUM

This laboratory study was designed to investigate the mechanism of the formation of the OH radicals during the ozonation of humic substances solutions. The evaluation of the formation of these radical species w as performed by using 1,1,2-trichloro ethane (TCA) as a probe. The app arent removal of TCA observed during the ozonation treatment implies t he production of secondary species that catalyze the generation of OH radicals from ozone. These species are formed by a reaction between H2 O2, formed in-situ, and O-3 and by a radical mechanism involving react ive humic substances sites.