铀(Ⅵ)-邻氯苯基荧光酮-Triton X-100析相显色体系的研究及应用

Study on Phase Separation Spectrophotometry of Uranium-o-Cl-PF-Triton X-100 System and its Application

研究了铀 ( ) -邻氯苯基荧光酮 - Triton X- 1 0 0析相显色体系 ,建立了在盐酸介质中 ,用 D2 3 5型阴离子交换树脂预分离 ,测定矿石中痕量铀的析相光度法。在 p H7.5三乙醇胺 -盐酸介质中 ,将铀 ( ) -邻氯苯基荧光酮 - Triton X- 1 0 0胶束溶液 95℃加热 1 h,铀 ( ) -邻氯苯基荧光酮 - Triton X- 1 0 0配合物被Triton X- 1 0 0相完全富集 ,其最大吸收峰为 560 nm,摩尔吸光系数为 1 .42× 1 0 5L·mol-1·cm-1,铀在 0～ 1 0 μg/5m L

Optimum conditions for phase separation and coloring reaction of uranium o Cl PF with Triton X 100 were studied, and a method for determination of trace uranium in ore was proposed.In pH 7.5 triethanolamine HCl buffer medium,the complex was enriched in Triton X 100 phase when being heated at 95±1℃ for 1 h in water bath. The maximum absorption of the complex is at 560 nm with an apparent molar absorptivity of 1.42×10 5 L·mol -1 ·cm -1 . Beer′s law was obeyed in the range of 0～10 μg/ 5 mL for uranium. The proposed method was applied to determination of trace uranium in ores with satisfactory results.