主题：【资料】流动注射电化学发光分析法测定煤灰中微量铀

流动注射电化学发光分析法测定煤灰中微量铀--《冶金分析》2008年02期

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　　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。
【作者单位】：天水师范学院生命科学与化学学院 甘肃天水741001
【关键词】：电化学发光;铀;煤灰;恒电位电解
【基金】：国家自然科学基金资助项目(No.20275023)
【分类号】：TQ533
【DOI】：CNKI:SUN:YJFX.0.2008-02-006
【正文快照】：
　　铀作为自然界最重的放射性元素,在地壳中分布极广。铀对生物的健康有很大影响。首先,铀元素及其衰变的产物都具有放射性,一旦进入食物链,就会造成食物的放射性污染,对人和动物的健康造成极大威胁。其次,铀元素作为一种重金属,其化学毒性很大,与镉、汞相似,但是自然丰度却要大得

　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/mL with 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.
【Keyword】：electrogenerated chemiluminescence;uranium;flow injection;coal ash;constant potential electrolysis