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Naphthol green B-sodium persulfate catalytic kinetic spectrophotometry determination of trace rhenium

Qu Jia;Fan Xuemei;College of Chemical Engineering and Modern Materials of Shangluo University;Materials Science and Engineering of Shangluo;  
Based on the coloring reaction of Naphtol green B oxidized by sodium persulfate in the medium of pH 6.47 phosphate buffer solution inhibited by rhenium,a new kinetic spectrophotometric method for the determination of trace amounts of rhenium was proposed.The dynamic conditions of the catalytic system was determined and the inhibition reaction apparent activation energy and the reaction rate constant was calculated,respectively,Ea=84.65KJ/mol and K=1.95×10-4/s.Under the optimal conditions,the rhenium concentration showed a good linear relationship with the absorbance in the 0.2-16.00mg/L range,the detection limit was 6.0ug/L.The method has been used for the determination of rhenium in roasting chimney of molybdenum minerals.The relative standard deviation was 2.1%-2.9% and the recoveriy was95.0%-104.0% with satisfactory.
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