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《Metallurgical Analysis》 2010-03
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Catalytic kinetic spectrophotometric determination of trace vanadium(Ⅴ) in sinter by vanadium-crystal violet system

WANG Hong-fu1,SU Zhi-xian2,CHEN De3,ZHANG Su-lan2,HE Li-ming1(1.School of Chemistry and Chemical Engineering,Mianyang Normal Universtity,Mianyang 621000,China;2.School of Life Science and Technologe,Mianyang Normal Universtity,Mianyang 621000,China; 3.Technology and Quality Department of Panzhihua Steel & Vanadium Co.,Ltd,Panzhihua 617062,China)  
This paper focused on the determination of trace vanadium(Ⅴ) by catalytic kinetic spectrophotometric method.Based on its oxidative fading reaction of crystal violet and potassium periodate in sulfuric acid medium,a new method for the determination of trace vanadium was established in the presence of citric acid as activator.The mass concentration of vanadium(Ⅴ) ρ remained good linear relationship with ΔA in the range of 0-0.06 μg/mL.The detection limit was 5.421 ×10-4 μg/mL.Relative standard deviation of the determination of 0.04 μg/mL V(Ⅴ) RSD was 1.24 %(n =11).The catalytic reaction was first-order reaction.The whole reaction was pseudo first order reaction.The apparent ratio constant was 2.055×10-4 /s and the apparent active energy was 50.05 kJ/mol.The method is of good selectivity and high sensitivity.The recovery ratio was between 100%-101% in the determination of trace vanadium(Ⅴ) in sample sinter steel.
【CateGory Index】: TF041
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