title: Cloud point extraction equilibrium of lanthanum(III), europium(III) and lutetium(III) using di(2-ethylhexyl)phosphoric acid and Triton X-100.
abstract: The cloud point extraction behaviors of lanthanoids(III) (Ln(III)=La(III), Eu(III) and Lu(III)) with and without di(2-ethylhexyl)phosphoric acid (HDEHP) using Triton X-100 were investigated. It was suggested that the extraction of Ln(III) into the surfactant-rich phase without added chelating agent was caused by the impurities contained in Triton X-100. The extraction percentage more than 91% for all Ln(III) metals was obtained using 3.0x10(-5)moldm(-3) HDEHP and 2.0% (v/v) Triton X-100. From the equilibrium analysis, it was clarified that Ln(III) was extracted as Ln(DEHP)(3) into the surfactant-rich phase. The extraction constant of Ln(III) with HDEHP and 2.0% (v/v) Triton X-100 were also obtained.
authors.affiliation: Department of Environmental Sciences, Faculty of Science, Ibaraki University, Mito 310-8512, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Ohashi
authors.forename: Takuma
authors.initials: T
authors.lastname: Hashimoto
authors.forename: Hisanori
authors.initials: H
authors.lastname: Imura
authors.forename: Kousaburo
authors.initials: K
authors.lastname: Ohashi