A New Catalytic Method for the Determination of Trace Amounts of Molybdenum With Linear Scan Voltammetry at a Dme

Abstract

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°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.

Keywords::

• Molybdenum
• Methyl orange
• Catalytic method
• Linear scan voltammetry