2002•Huaxue Shijie (Chemical World)Requires access
Kinetic Spectrophotometry Determination of Ruthenium Based on Its Catalytic Activity for Oxidation of Arsenazo I by Potassium Periodate
Yang Xiao
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Abstract
A new catalytic spectrophotometric method has been developed for the determination of ruthenium(Ⅲ) based on its catalytic activity for oxidation of arsenazo I by KIO 4 in H 3PO 4 medium at 90±0.5°C. Beer's law was obeyed in the Ru(Ⅲ) concentration range of 0~0.08 μg/10 mL, and the detection limit was 3.47×10 -4 μg/mL. The relative standard deviation for the determination of Ru(Ⅲ) at the concentration of 0.05 μg/10 mL was 1.47%( n =10). The results of the studies on the kinetic parameters suggested that the catalytic reaction is first order and the apparent activation energy of this reaction is 58.82 kJ/mol. The method has been successfully applied for the determination of trace amount of ruthenium in some ore and metallurgy products with the relative standard deviation of 1.73%~2.03% and the recovery of 97%~105%.