a method for oxidatively breaking down organic compounds that have low biodegradability and are difficult to oxidize chemically in aqueous effluents , by using a water - soluble peroxide oxidant in the presence of a water - soluble iron or manganese metallophthalocyanine immobilized on an ionic resin consisting of a cross - linked insoluble copolymer derived from a vinylaromatic monomer comprising cationic or anionic groups . the method is particularly suitable for oxidatively decomposing polyhalogenophenols and halogenated hydrocarbons .