铀的灵敏分光光度法。
Sensitive spectrophotometric method for trace amounts of uranium.
机构信息
Chemical Laboratories, University of Allahabad, Allahabad, India.
出版信息
Talanta. 1979 Dec;26(12):1167-9. doi: 10.1016/0039-9140(79)80034-x.
A sensitive spectrophotometric method for the determination of uranium with Pyrogallol Red (PGR) and cetyltrimethylammonium bromide (CTAB) is described. The sensitivity of the colour reaction between uranium and Pyrogallol Red is greatly increased in the presence of cetyltrimethylammonium bromide. The blue ternary complex (lambda(max)580 nm) has composition 1:2:4 [U(VI):PGR:CTAB] at pH 5.6. Beer's law is obeyed over the range 19.0-0.24 ppm of uranium and the molar absorptivity is 3.3 x 10(4) l.mole(-1).cm(-1) at 620 nm. A tentative structure for the ternary complex is suggested. A simple method is suggested for evaluation of stability constants of such ternary complexes.
本文描述了一种用没食子酸红（PGR）和十六烷基三甲基溴化铵（CTAB）测定铀的灵敏分光光度法。在存在十六烷基三甲基溴化铵的情况下，铀与没食子酸红之间的显色反应灵敏度大大提高。在 pH 5.6 时，蓝色三元配合物（λ(max)580nm）的组成为 1:2:4[U(VI):PGR:CTAB]。在 19.0-0.24ppm 铀的范围内遵守比尔定律，摩尔吸光系数在 620nm 时为 3.3x10(4)l.mole(-1).cm(-1)。提出了三元配合物的暂定结构。还提出了一种用于评估此类三元配合物稳定常数的简单方法。
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