THE ELECTROCHEMICAL BEHAVIOUR OF AMMONIUM LIGNOSULPHONATE SOLUTIONS DEGRADED WITH S_2O_8~(2-)/Ag~+ AND FENTON OXIDATIVE SYSTEMS

摘要

A comparative study of oxidative degradation with S_2O_8~(2-)/Ag~+ and Fenton systems was performed on a series of ammonium lignosulphonate (ALS)solutions of different concentrations (0.079-3.785 mg/mL~(-1)),by means of cyclic voltametry.These oxidized solutions have a complex composition and are susceptible of mutual interferences.However,cyclic voltametry can give only an overall view and estimation of such redox processes.The obtained voltammograms are quite different,as a function of the oxidants selected,and of the preliminary results (UV-VIS spectrophotometry,conductibility and turbidity data,total amount of hydroxylated aromatic compounds)obtained.