FLOW-INJECTION AMPEROMETRIC DETECTION OF HYDRAZINE BY ELECTROCATALYTIC OXIDATION AT A PERFLUOROSULFONATED IONOMER RUTHENIUM OXIDE PYROCHLORE CHEMICALLY-MODIFIED ELECTRODE

A Nafion/ruthenium oxide pyrochlore (Pb2Ru2-xPbxO7-y)- modified glassy carbon electrode exhibits excellent electrocatalytic activity in the oxidation of hydrazine in neutral media. The catalyst is synthesized directly inside the Nafion thin film matrix, which is spin coated onto a glassy carbon electrode, Hydrazine is detected by now injection analysis at the modified electrode with excellent sensitivity, Linear calibration curves are obtained over the 5 x 10(-5)-6 x 10(-7) M range with pH 8.0 ammonia-ammonium chloride buffer solution as the carrier. The detection limit is 0.048 ng. The practical analytical utility is illustrated by selective flow injection measurements of hydrazine in the presence of oxalic acid and surface-active materials.