摘要
基于H2SO4-硼砂介质中,钼抑制H202氧化甲基绿的显色反应,建立了测定痕量钼的新方法。确定了抑制褪色反应测定钼的动力学条件,抑制反应的表观活化能Ea=14.64 kJ/mol,反应速率常数K'=3.77×10-4/s。方法线性范围为0～0.5 mg/L,检出限为3.82μg/L。方法的表观摩尔吸收系数ε=5.357×105L.mol-1.cm-1。用于本地钼尾矿中钼含量的测定,相对标准偏差为2.3%～3.1%,标准加入回收率为96.0%～104%,结果令人满意。
A new kinetic spectrophotometric method for the determination of trace amounts of molybdenum has been proposed . It was based on the molybdenum inhibited coloring reaction of methyl green oxidized by hydrogen peroxide in the sodium borate-sulphuric acid medium. The optimum conditions and kinetic parameters were investigated. The apparent activation energy of inhibition reaction is 14.64 kJ/mol and the apparent reaction rate is 3.77 × 10 -4/s. The linear range of determination of molybdenum was 0 - 0. 5 mg/L and the detection limit was 3.82 μg/L. The apparent molar absorption coefficient is 5. 357 × 105 L · mol^-1· cm-1. The method has been used for the determination of trace amounts of molybdenum in gangue. The relative standard deviations were 2. 3% - 3. 1% and the recoveries were 96.0% - 104% with satisfactory results.
出处
《分析试验室》
CAS
CSCD
北大核心
2012年第11期94-96,共3页
Chinese Journal of Analysis Laboratory
基金
商络学院服务地方经济项目(12SKY-FWDF014)资助
关键词
抑制动力学光度法
钼
甲基绿
Catalytic spectrophotometry
Molybdenum
Methyl green
