A NEW CATALYTIC METHOD FOR THE DETERMINATION OF TRACE AMOUNTS OF MOLYBDENUM WITH LINEAR SCAN VOLTAMMETRY AT A DME

The experiments show that Mo(VI) has very strong catalytic effect on the slow redox reaction between methyl orange and hydrazine sulfate in sulphuric acid medium at 100 degrees C. And methyl orange exhibits a sensitive second derivative wave at -0.72 V vs. SCE in the supporting electrolyte of NaOH, This provides a novel catalytic method for the determination of trace amounts of molybdenum using linear scan voltammetry as detection technique. A Calibration graph from 1 to 80 ng/ml and detection limit of 0.3 ng/ml Mo were obtained by the fixed-reaction time procedure. This new catalytic method has been applied to determining molybdenum in ore and standard steel samples, with excellent results.