摘要
基于硫酸-柠檬酸钠介质中,钒(Ⅴ)催化H2O2氧化甲基绿的显色反应,建立了测定痕量钒(Ⅴ)的光度分析新方法。确定了催化褪色反应测定钒(Ⅴ)的动力学条件,催化反应的表观活化能E′a=83.34kJ/mol,反应速率常数K′=2.25×10-4/s。方法线性范围为0.20～80μg/L,检出限为0.88μg/L。方法的表观摩尔吸光系数ε=3.31×105L/(mol·cm)。用于本地钒尾矿中钒含量的测定,相对标准偏差为2.2%～2.9%,标准加入回收率为98.8%～102.9%。
A new kinetic spectrophotometric method for the determination of trace amounts of vanadium has been proposed.It was based on the coloring reaction of methyl green and hydrogen peroxide,which is catalyzed by vanadium in the sodium citrate-sulphuric acid medium.The optimum conditions and kinetic parameters were investigated.The apparent activation energy of catalytic reaction was 83.34kJ/mol and the apparent reaction rate was 2.25×10-4/s.The linear range of determination of vanadium was 0.2080μg/L and the detection limit was 0.88μg/L.The apparent molar absorption coefficient was 3.31×105 L/（mol.cm）.The method was used for the determination of trace amounts of vanadium in gangue.The relative standard deviation was 2.2%-2.9%and the recovery was 98.8%-102.9%.
出处
《分析科学学报》
CAS
CSCD
北大核心
2013年第3期419-421,共3页
Journal of Analytical Science
基金
陕西省科技统筹创新工程计划(No.2012KTDZ02-02-02)
商洛学院服务地方专项项目(12SKY-FWDF014)
关键词
催化动力学光度法
钒
甲基绿
Catalytic kinetic spectrophotometry
Vanadium
Methyl green
