ELECTROCATALYTIC OXIDATION AND ION-CHROMATOGRAPHIC DETECTION OF BR-, I-, SO32-, S2O32- AND SCN- AT A PLATINUM PARTICLE-BASED GLASSY-CARBON MODIFIED ELECTRODE

A modified method for dispersing platinum particles on a glassy carbon (GC) electrode was investigated. The ultramicro Pt particle-modified electrode obtained exhibited high catalytic stability and activity tow ards the oxidation of some halide ions (Br-, I-) and inorganic sulfur species (S2O32-, SO32- and SCN-). These anions were separated and dete cted by using ion chromatography and electrochemical detection via thi s novel dispersed Pt particles-GC working electrode. The detection lim its were 20 ng/ml for Br-, 1.0 ng/ml for I-, 10 ng/ml for SO32- and 4. 0 ng/ml for SCN-. This method was employed for the analysis of industr ial and environmental waste waters.