Spectrofluorimetric determination of titanium with 2-methyl-5-hydroxy-7-methoxyisoflavone

Abstract

Titanium reacts with hydroxy and methoxy derivatives of 5-hydroxyflavone and 5-hydroxyisoflavone to form water-insoluble complexes that can be extracted into carbon tetrachloride. The absorptive and fluorescent characteristics of the titanium complexes of these derivatives have been studied. The best fluorescent reagent for the determination of titanium is 2-methyl-5-hydroxy-7-methoxyisoflavone. The maximum wavelengths of the excitation and emission spectra of the titanium complex in carbon tetrachloride are 390 and 520 nm, respectively. Titanium can be determined in the range 0.05–1.3 µg ml^–1 when extracted from the solution at pH 7.0–7.5 into carbon tetrachloride.