水杨基荧光酮-过氧化氢催化动力学光度法测定痕量锇(Ⅳ)  

Spectrophotometric-Kinetic Determination of Trace Osmium(Ⅳ) by the Salicylfluorone-Hydrogen Peroxide Reaction

作　　者：贾丽[1] 夏冰[1] 胡之德[1] 

机构地区：[1]兰州大学化学系,兰州730000

出　　处：《分析化学》1996年第3期315-317,共3页Chinese Journal of Analytical Chemistry

摘　　要：在碱性介质中，痕量锇（Ⅳ）对水杨基荧光酮（SAF）与过氧化氢的氧化还原反应有显著的催化作用。本文以此为基础，提出用分光光度催化动力学法测定痕量锇（Ⅳ）的新方法。本法来加掩蔽剂时的线性范围是0．08～0．80μg／L，加入掩蔽剂后的线性范围是0．08～0．80μg／L，检出限为0．08μg／L。本法用于实际样品中Os（N）的测定，结果良好，本实验还测定了此催化反应的活化能和反应级数。A highly sensitive spectrophotometric kinetic method is proposed for the determi nation of trace osmium(Ⅳ) based on the catalytic effect of osmium(Ⅳ ) on the salicylfluo rone (maximum absorption at 504 nm )-hydrogen peroxide reaction. Using the fixed time method, osmium(Ⅳ) in the ragne of 0.08~0.56μg/L conforms to Beer's law without the masking agent, and in the range of 0.08~0.80μg/L with the masking agent. The detection limit is 0. 08 μg/L. This catalytic reaction is a first order reaction and its activation energy is 23. 25 kJ/mol. The method has been applied successfully to the determination of osmium in refined ore with a relative standard deviation of 2%~4%.

关 键 词：锇 水杨基荧光酮 动力学分析 光度法 

分 类 号：O614.824[理学—无机化学] O657.32[理学—化学]