过氧化氢氧化邻硝基苯基荧光酮褪色反应动力学光度法测定痕量钌  

Kinetic spectrophotometric determination of trace ruthenium based on oxidation of o-nitrophenylfluorone with hydrogen peroxide

作　　者：周之荣[1] 张丽珍[2] 王群[3] 章淑媛[3] 张圆玲 苏志文 

机构地区：[1]广东药学院公共卫生学院,广东广州510240 [2]广东药学院附属门诊部,广东广州510240 [3]东华理工大学校医院,江西抚州344000 [4]江西省临川第一中学,江西抚州344100

出　　处：《冶金分析》2008年第12期66-69,共4页Metallurgical Analysis

基　　金：广东药学院科研基金资助项目

摘　　要：基于NaOH碱性介质中，痕量钌（Ⅲ）催化H2O2氧化邻硝基苯基荧光酮（o-NO2-PF）的褪色反应，建立了测定痕量钌（Ⅲ）的动力学光度法。在固定加热时间段（6min）后，通过加入HCl酸化终止催化反应，于465nm处测定o-NO2-PF的吸光度降低值监控反应速率。方法检出限为0．01μg／L，校准曲线的浓度线性范围为0．0～1．0μg／L。测定0．02μg钌（Ⅲ）的相对标准偏差为2．06％（n=11）。研究了反应的最佳条件，并测定了一些动力学参数，催化反应的表观活化能为73．95kJ／mol。方法用于矿样和冶金产品中钌（Ⅲ）的测定，结果与推荐值相符，相对标准偏差为1．78％～2．84％，加标回收率为97．5％～104．4％。A spectrophotometric method for the determination of ruthenium（Ⅲ） is described, based on its catalytic effect on the oxidation reaction of o-nitrophenylfluorone （o-NO2-PF） with hydrogen peroxide in sodium hydroxide medium at 60 ℃. The above catalytic reaction is terminated through acidification by the addition of hydrochloric acid after a fixed time （6 min）, and the reaction rate is monitored spectrophotometrically by measuring the decrease in the absorbance of o-NO2-PF at 465 nm. The calibration curve is linear in the concentration range over 0. 0-1.0μg/L ruthenium（Ⅲ）） and the detection limit of the method is 0.01 μg/L. The optimum conditions of reaction are established and some kinetic parameters are determined. The apparent activation energy of catalytic reaction is 73.95 kJ/mol. The relative standard deviation for ruthenium（Ⅲ） of 0. 02 μg in 25 mL is 2.06 % （n=11）. The method has been successfully applied for the determination of trace ruthenium in some ores and metallurgy products with the relative standard deviations （RSD） of 1.78 %- 2. 84% and the recovery over 97.5%-104.4 %.

关 键 词：动力学光度法 钌(Ⅲ) 邻硝基苯基荧光酮 过氧化氢 

分 类 号：O657.32[理学—分析化学]