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 t he slow redox reaction between methyl orange and hydrazine sulfate in sulphuric acid medium at 100 degrees C. And methyl orange exhibits a s ensitive second derivative wave at -0.72 V vs. SCE in the supporting e lectrolyte of NaOH, This provides a novel catalytic method for the det ermination of trace amounts of molybdenum using linear scan voltammetr y as detection technique. A Calibration graph from 1 to 80 ng/ml and d etection limit of 0.3 ng/ml Mo were obtained by the fixed-reaction tim e procedure. This new catalytic method has been applied to determining molybdenum in ore and standard steel samples, with excellent results.