Spectrophotometric Studies on Organometallic Complexes Used in Analytical Chemistry. VII : Spectrophotometric Determination of Uranium with Flavonol

概要

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Flavonol forms a yellow complex with uranyl ion which is soluble with difficulty in various organic solvents, but easily soluble in tri-n-butyl phosphate (TBP). The TBP solution of this complex shows an absorption spectrum which has a flat portion of maximum absorbancy at 400〜415 mμ. When the pH of the aqueous phase was kept between 6.0 and 7.0, and the concentration of flavonol in TBP-n-hexane (1 : 1) was above 8.4×10^<-4> mol/l, the maximum absorbancy was observed. Therefore, the concentration of flavonol was fixed at 1.3×10^<-3> mol/l (0.03%) for the determination of uranium. The calibration curve obeyed Beer's law below, at least, 10γ/ml of uranium. The molar extinction coefficient was 28, 700 at 410 mμ, which was about 1.6 times that of the quercetinsulfonic acid method and about 3 times that of the dibenzoylmethane method.
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