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《Metallurgical Analysis》 2004-06
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Catalytic kinetic spectrophotometric determination of trace vanadium with vanadium V-sodium hypophosphite-arsenazo Ⅲ system

ZHOU Zhi-rong~*,XU Wen-yuan,PENG Dao-feng,WANG Li(Department of Applied Chemistry,East China Institute of Technology,Fuzhou 344000,China)  
A new kinetic spectrophotometric method for the determination of trace vanadium *% has been developed;the method is based on the inhibitory effect of trace vanadium*% on the reduction of arsenazoⅢ(AsAⅢ) with sodium hypophosphite in 0.016 mol/L sulphuric acid solution.Beer's law is obeyed in the concentration of 0~4.0 μg/L for vanadium*% with the detection limit of 0.058 μg/L.The relative standard deviation for the determination of vanadium*% at the concentration of 0.1 μg/25 mL is calculated to be 1.5%(n=11).The factors such as acidity,concentrations of reactant,reactive time,temperature, influence of coexisting ions on the reaction and the optimum conditions of reaction and some kinetic parameters are determined; the apparent activation energy of the reaction is 46.80 kJ/mol.The method has been applied to the determination of trace vanadium*% in human hair and tea samples with the relative standard deviation of 3.0%~4.2% and the recovery of 98.2%~101.4%.
【Fund】: 东华理工学院院长基金资助项目 (DHYO44 9)
【CateGory Index】: O657.32
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