催化动力学光度法测定痕量Re(Ⅶ)  

Determination of Trace Re(Ⅶ) by Catalytic Kinetic Spectrophotometry

作　　者：党楠[1] 马高峰 

机构地区：[1]商洛学院电子信息与电气工程学院,陕西商洛726000 [2]西部鑫兴稀贵金属有限公司,陕西商洛726000

出　　处：《分析科学学报》2015年第4期583-585,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)

摘　　要：在H2SO4介质中,Re（Ⅶ）可以催化NaBrO3氧化铬蓝黑R的褪色反应,据此,建立了测定Re（Ⅶ）的催化动力学光度分析的新方法。确定了催化体系的动力学条件,并计算了催化反应的表观活化能Ea=44.82kJ/moL,反应速率常数K=1.35×10-3/s。在最佳实验条件下,Re（Ⅶ）的浓度在0.2-12.0mg/L范围内与吸光度变化值呈良好的线性关系,检出限为0.1mg/L。该方法简单、快速。In this paper,we found that in sulfuric acid medium,rhenium catalyzed the reaction of sodium bromate oxidizing eriochrome blue black-R.Based on this,a new catalytic kinetic spectrophotometric method was developed for the determination of Re（Ⅶ）.The dynamic conditions of the catalytic system was determined and the catalytic reaction apparent activation energy Ea=44.82kJ/mol and the reaction rate constant K =1.35×10-3/s were calculated,respectively.Under the optimal conditions,the Re（Ⅶ）concentration showed a good linear relationship in the range of 0.2-12.0mg/L,and the detection limit was 0.1mg/L.The method is simple and fast.

关 键 词：紫外-可见分光光度法 溴酸钠 铬蓝黑R 高铼酸铵 

分 类 号：O657.39[理学—分析化学]