1978 年 98 巻 9 号 p. 1145-1151
The behavior of o-hydroxyhydroquinonephthalein (Qn.Ph.) was studied by spectrophotometry in the presence of a cationic, anionic, or nonionic surface-active agents in water-methanol solvents. A sensitive and simple spectrophotometric determination of uranium (VI) with Qn.Ph. and a quaternary ammonium salt was established. The dissociation equilibrium constants were respectively calculated by spectrophotometric method in water-methanol solvents with and without the presence of a surface-active agent. A spectrophotometric method for the determination of uranium (VI) based on the coloration of the uranium (VI)-Qn.Ph. complex solubilized in the cetyltrimethylammonium chloride miscelle, can be applied in the concentration range of 0-3.6μg/ml of uranium (VI). The apparant molar extinction coefficient at 555 nm is 9.4×104.