【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。更多还原

【Abstract】 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 1.07×10⁵ 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.更多还原