钌催化甲基紫褪色动力学光度法测定痕量Ru(Ⅲ)  

Determination of Trace Ruthenium(Ⅲ) with Ruthenium Catalyzing Potassium Periodate Oxidizing Methyl Violet Fading Kinetic Spectrophotometric

作　　者：王洪福[1] 苏智先[2] 罗英[3,4] 杨森[1] 

机构地区：[1]绵阳师范学院化学与化学工程学院,四川绵阳621000 [2]绵阳师范学院生态与环境保护四川省重点实验室,四川绵阳621000 [3]绵阳师范学院 [4]绵阳师范学院生命科学与技术学院,四川绵阳621000

出　　处：《绵阳师范学院学报》2012年第2期39-42,共4页Journal of Mianyang Teachers＇ College

摘　　要：基于稀H2SO4介质中及70℃水浴加热下,Ru(Ⅲ)对高碘酸钾氧化甲基紫褪色反应有明显的催化作用,且催化作用的强弱与钌的加入量成正比,据此建立了催化动力学光度法测定痕量Ru(Ⅲ)的新光度分析方法。研究了反应的最佳条件。非催化反应与催化反应于波长581 nm处的吸光度差值与Ru(Ⅲ)的质量浓度ρ在0.02～1.5μg/25mL范围内呈良好的线性关系,检出限为1.933×10-10g/mL。测定了动力学参数,反应对Ru(Ⅲ)为一级反应,在试验条件下,总反应为准一级反应,表观速率系数为5.967×10-4/s,表观活化能为49.36 kJ/mol。对1.0μg/25mLRu(Ⅲ)标准试液测定的相对标准偏差为1.8%(n=11)。方法用于分子筛和活性炭样品中钌(Ⅲ)的测定,结果满意。On condition of heating to 70℃ in water bath and diluted H2SO4 used as medium,the fading reaction in potassium periodate catalyzing methyl violet can be catalyzed by ruthenium（III）,and based on this phenomenon,a new catalytic kinetic spectrphotometry determination of ruthenium（III） has been founded.The optimum experimental conditions of the catalytic reaction was studied,and the absorbance difference between non-catalytic reaction and catalytic reaction remained good linear relationship with mass concentration ρ of ruthenium（III） in the range of 0.02~1.5μg/25mL at wavelength 581nm.The detection limit was 1.933×10-10 g/mL.The kinetic parameters were determined and showed that the reaction was first order to ruthenium（III） and pseudo first order to the whole reaction.The apparent rate constant was 5.967×10-4 /s,and the apparent active energy was 49.36 kJ/mol.The relative standard deviation for the determination of 1.0 μg /25mL ruthenium standard solution was 1.8%（n=11）.Applied to the determination of ruthenium in molecular sieve and active carbon samples,the recovery of this method was 98.8%~102.2% which fulfilled the requirement of analysis.

关 键 词：催化动力学光度法 甲基紫 活性炭 分子筛 钌(Ⅲ) 

分 类 号：O657.32[理学—分析化学]