催化动力学褪色光度法测定痕量钌  

Catalytic Kinetic Discoloring Spectrophotometric Determination of Trace Ruthenium by Ethyl violet-System

作　　者：吴芳辉[1] 汪芳[1] 童碧海[1] 储向峰[1] 栗少丽[1] 

机构地区：[1]安徽工业大学化学与化工学院,安徽马鞍山243002

出　　处：《铜业工程》2011年第5期86-88,共3页Copper Engineering

基　　金：国家自然科学基金(50903001和50975002);安徽省教育厅自然科学重点基金(KJ2011A054);安徽工业大学青年基金(201005)以及安徽工业大学SRTP项目(2011013)资助

摘　　要：在HAc-NaAc缓冲介质中,基于钌(III)对高碘酸钾氧化乙基紫(EV)的褪色反应有明显的催化作用,建立了简便、快速测定痕量钌的新体系。优化了试剂浓度、缓冲介质和反应温度等对测定有影响的反应条件,结果表明,钌在0.5～50 ng/mL范围内与吸光度差值有良好的线性关系,相关系数为0.9937,方法的检出限为1.4×10-10 g/mL。对25 ng/mL Ru(III)重复测定9次的相对标准偏差为2.8%。发现大多数常见离子不干扰测定。方法用于天然水样中痕量钌的测定,获得满意结果。A simple and rapid kinetic method for trace ruthenium determination was developed,basing on its obvious catalytic effect on the color fading reaction of ethyl violet oxidized by potassium periodate in HAc-NaAc buffer.The reaction conditions which have influence on determination like reagent concentration,buffer and reaction temperature are optimized.It＇s proved that the linear relationship between ruthenium and absorbance differentials are good when ruthenium is in the range of 0.5 ~ 50 ng mL-1（r=0.9937） with the detection limit of 1.4×10-10 g/mL.Relative standard deviation for nine repeated measurements of 25 ng/mL ruthenium was 2.8 %.Most common ions do not interfere with the determination.The proposed method has been successfully applied to determine ruthenium in natural water samples.

关 键 词：催化动力学光度法 钌 乙基紫 高碘酸钾 测定 

分 类 号：O657.32[理学—分析化学]