title: Spectrophotometric determination of titanium with o-carboxyphenylfluorone in cationic micellar media, and its equilibrium and kinetic studies.
abstract: Spectrophotometric determination of titanium(IV) was accomplished with o-carboxyphenylfluorone (OCPF) in the presence of hexadecyltrimethyl ammonium chloride (HTAC) under strongly acidic media. In the determination of titanium(IV), Beer's law was obeyed in the range of 24-340 ng mL(-1) with an effective molar absorption coefficient (at 530 nm) and relative standard deviation of 2.24 × 10(5)dm(3)mol(-1)cm(-1) and 0.64% (n=8), respectively. The severe interference of iron ions was easily eliminated by the addition of ethylenediaminetetraacetic acid (EDTA); the effects of other foreign substances were low. Equilibrium and kinetic studies under analytical conditions were investigated to quantitatively evaluate the reaction mechanism. The obtained orange complex is considered to be Ti(OCPF)(4). Its stability log K(f) and rate constant K(obs) are 16.88 and 1.65 × 10(-2)s(-1), respectively. It is suggested that the color of the complex is related to the species of OCPF in the solution.
authors.affiliation: Osaka University of Pharmaceutical Sciences, Nasahara, 4-20-1 Takatsuki, Osaka 569-1094, Japan.
authors.forename: Mitsuru
authors.initials: M
authors.lastname: Hoshino
authors.forename: Shinichiro
authors.initials: S
authors.lastname: Kamino
authors.forename: Shota
authors.initials: S
authors.lastname: Mitani
authors.forename: Mamiko
authors.initials: M
authors.lastname: Asano
authors.forename: Takako
authors.initials: T
authors.lastname: Yamaguchi
authors.forename: Yoshikazu
authors.initials: Y
authors.lastname: Fujita
mesh_terms: D002138:Calibration; D002412:Cations; D004492:Edetic Acid; D005452:Fluoresceins / Q000737:chemistry*; D007700:Kinetics; D057230:Limit of Detection; D008823:Micelles; D014025:Titanium / Q000737:chemistry*
chemical_list: C442461:4-carboxyphenylfluorone; D002412:Cations; D005452:Fluoresceins; D008823:Micelles; D004492:Edetic Acid; D014025:Titanium