流动注射电化学发光分析法测定煤灰中微量铀  

Flow injection electrogenerated chemiluminescence determination of uranium in coal ashes

作　　者：杨玲娟[1] 

机构地区：[1]天水师范学院生命科学与化学学院,甘肃天水741001

出　　处：《冶金分析》2008年第2期15-18,共4页Metallurgical Analysis

基　　金：国家自然科学基金资助项目(No.20275023)

摘　　要：采用恒电位电解技术,使不具发光活性的铀（Ⅵ）通过自制的流通式碳电解池后,在-0.70 V（vs.Ag/AgCl）电位下在线还原为铀（Ⅲ）,铀（Ⅲ）与鲁米诺在碱性条件下产生化学发光,从而建立了铀（Ⅵ）的流动注射电化学发光分析法。方法的线性范围为1.0×10^-9～1.0×10^-5g/mL,检出限为2×10^-10g/mL,对1.0×10^-7g/mL铀（Ⅵ）进行13次测定,得到相对标准偏差为2.5%。该方法用于煤灰中微量铀（Ⅵ）的测定,结果良好。A flow injection electrogenerated chemiluminescence method for the determination of uranium is described. Uranium （Ⅵ） was on line reduced to uranium （Ⅲ） by a constant potential electrolysis technique at the potential of -0. 70 V （vs. Ag/AgCl electrode） using a self-made flow-through carbon electrolytic cell , then the produced uranium （Ⅲ） reacted with luminol in alkaline solution to produce chemiluminescence. The chemiluminescent intensity is linear with the concentration of uranium in the range 1.0×10^-9-1.0×10^-5 g/mLwith a detection limit （3σ） of 2×10^-10 g/mL. The relative standard deviation is 2.5% for 1.0×10^-7 g/mL uranium in 13 replicated measurements. The method has been applied to the determination of uranium in coal ash samples.

关 键 词：电化学发光 铀 煤灰 恒电位电解 

分 类 号：TQ533[化学工程—煤化学工程]