苯基荧光酮分光光度法测定煤灰中微量铀  

Spectrophotometric determination of trace uraniumⅥ in coal ashes with phenylfluorone

作　　者：周秀林[1] 周文辉[1] 

机构地区：[1]湖南科技大学化学化工学院,湖南湘潭411201

出　　处：《冶金分析》2005年第2期56-58,共3页Metallurgical Analysis

摘　　要：在pH10的氨性缓冲溶液中,CTMAB存在下,铀与苯基荧光酮生成稳定的有色络合物。其表观摩尔吸光系数为1 07×105,最大吸收波长为560nm,络合物组成比为铀∶苯基荧光酮=1∶3。在25mL溶液中,铀质量在0～20μg范围内遵守比尔定律。方法灵敏度高,络合物稳定时间长。煤灰经溶解处理后,采用三辛胺-二甲苯萃取分离干扰离子,本法测定其中微量铀,获得了满意结果。In the presence of cetyltrimethylammonium bromide(CTMAB), a stable complex of uranium *& with phenylfluorone(PF) is formed in the buffer solution of ammonia-ammonium chloride(pH 10).The apparent molar absorptivity of color complex is 1.07×10~5 L·mol^(-1)·cm^(-1).The maximum absorption wavelength is at 560 nm.The molar ratio of uranium*& to PF in complex is 1∶3.Beer's law is obeyed in the range of 0-20 μg/25 mL for uranium*&.This method is high sensitive and the color complex is stable.The interference of foreign ions can be separated by solvent extraction with tri-n-octylamine-xylene.The proposed method has been applied to the determination of trace uranium in coal ashes with satisfactory results.

关 键 词：苯基荧光酮 分光光度法测定 微量铀 煤灰 表观摩尔吸光系数 最大吸收波长 CTMAB 络合物 缓冲溶液 比尔定律 稳定时间 干扰离子 萃取分离 组成比 灵敏度 二甲苯 三辛胺 

分 类 号：O657.32[理学—分析化学]