Enhancement of Radical Chain Reactions of Ozone in Water in the Presence of an Aquatic Fulvic Acid

摘要

In this work, the rate constants of ozone consumption by an aquatic fulvic acid were determined in a special batch reactor atifferent pH values and in the presence or absence of t–butyl alcohol, a well known free–radical scavenger. We have found, for ratios [FA]o/[O3]o17 mole C/mole O3, that reactions are of first order for ozone consumption (between pH 2 and 8). Results show that the fulvic acid does not participate in the radical type decomposition of ozone at strongly acidic pH (pH = 2), and that it becomes, with increasing pH (increased dissociation degree of its acidic groups), promoter of the decomposition of ozone in water.