Spectrophotometric determination of titanium with o-carboxyphenylfluorone in cationic micellar media, and its equilibrium and kinetic studies

Mitsuru Hoshino, Shinichiro Kamino, Shota Mitani, Mamiko Asano, Takako Yamaguchi, Yoshikazu Fujita

Research output: Contribution to journalArticle

7 Citations (Scopus)


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 × 105 dm3 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 Kf 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.

Original languageEnglish
Pages (from-to)2339-2343
Number of pages5
Issue number5
Publication statusPublished - Oct 15 2011



  • Equilibrium
  • Kinetics
  • Spectrophotometry
  • Titanium
  • o-Carboxyphenylfluorone (OCPF)

ASJC Scopus subject areas

  • Analytical Chemistry

Cite this