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《Analytical Laboratory》 2005-08
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Determination of trace Vanadium(Ⅴ) by catalytic kinetics discoloring spectrophotometric

SHA Ren, A Gu-la and ZHUANG Xiao-juan(Chemistry & Environment Science College of Inner Mongolia Normal University, Huhehaote 010022)  
Based on the catalytic effects of vanadium(Ⅴ) on the discoloring reaction of chlorophos-phonazo mA oxidized by KBrO_3 and activation effect of citric acid in a medium of phosphoric acid, a new method for the determination of vanadium was proposed. The experimental results indicate that the system is quasi-zero-order reaction without citric acid. The apparent activation energy is 54.3 kJ/mol. In the presence of citric acid, the system is a quasi-one-order reaction. The apparent activation energy is 30.9 kJ/mol. Linear relationship between log(A_0/A) and the concentration of vanadium is observed in the range of 05.010~(-8) g/mL. The limit of detection is 5.610~(-11) g/mL. In the presence of NH_4F and urea, most of the common ions did not interfere with the determination of vanadium. It is applied to the direct determination of trace vanadium in steel samples.
【Fund】: 内蒙古自治区自然科学基金资助项目(200408020213)
【CateGory Index】: O657.3;TG115.33
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2 Chen Wen,Wang Zhengmeng,Wu Xiaorong,Wang Lixia (College of Material & Biologic engineering,Chengdu University of Technology,Chengdu 610059);Determination of Micro-Amount of Molybdenum in Steel & Iron by single sweep polarography[J];Sichuan Nonferrous Metals;2003-03
3 Lai Dongmei Li Zhi Wei Jun;Determination of Molybdenum by Complex Titrimery in the Mo-Fe alloy[J];Sichuan Nonferrous Metals;2003-04
4 CUI Gui xian,LIU He nan,ZHANG Rui zhi,ZHANG Li (Tianjin Environmental Monitoring Centre, Tianjin 300191,China);Modification on Method of Determining Total Chromium in Soil[J];Urban Environment & Urban Ecology;2001-05
5 Sun Baolian 1.2 ,Zhang Xiaoyan 1 ,Li Bo 2 (1.Northwest University ,Xian 710069,China)(2.Northwest Institute for Nonferro us Metal Research,Xian 710016,Chi na);Determination of Trace Titanium in Metallurgical Material[J];Rare Metal Materials and Engineering;2003-01
6 ZHU Xiu-hui,YU Hong-mei,ZHU Xiao-ming,DOU Yong-hu,WANG Juan (School of Chemical and Engineering,Anshan University of Science and Technology,Anshan 114044,China);Simultaneous flow injection-spectrophotometer determination of iron and nick by artificial neural networks[J];Journal of Northeast Normal University (Natural Science Edition);2004-02
7 GAO Ying-jian (Beijing General Research Institute of Mining & Metallurgy, Beijing 1000 44, China);Determination of Trace Aluminum in High Pure Bismuth Oxide with Spectrophotometry by Micellar Solubilization of Chrome Azurol S[J];Analysis and Testing Technology and Instruments;2003-01
8 WU Yun, XIONG Xiao- li(Department of Technology Fenghua Machine Factory, Guizhou563319, China);Determination of Nd、Zn、Zr、Fe、Si in Magnesium Alloy (ZM6) by ICP- AES[J];Analysis and Testing Technology and Instruments;2003-04
9 ZHENG Zhen-feng(Department of Food Engineering, Zhangzhou University of Technology, Zhangzhou 363000, China);Ultraviolet Spectrophotometric Determination of Neodymium(Ⅲ)with 7-lodo-8-hydroxyquinoline-5-sulfonicAcid (Ferron) and Cetyl Trimethylammonium Bromide[J];Analysis and Testing Technology and Instruments;2004-01
10 XUE Guang-rong(Shanghai Institute of Space Power-Sources, Shanghai 200233, China);Atomic Absorption Spectrometry to Measure the Content of Titanium in the Stainless Steel[J];Analysis and Testing Technology and Instruments;2005-02
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