On the surfactant-sensitized analytical reaction of titanium with bromopyrogallol red

A spectrophotometric investigation of the Ti(IV)-bromopyrogallol red chelate shows that marked changes occur in the presence of aqueous dispersions of cetylpyridinium bromide. The increase in the absorption and the bathochromic shifts are interpreted in terms of the interaction of the binary complex Ti(IV)-BPR with the surfactant in the micelles. Analytical parameters for the spectrophotometric determination of Ti(IV) with bromopyrogallol red and cetylpyridinium bromide have been worked out in detail and are given as well. In basis of the experimental results an attempt is made to extend this approach to the understanding of the sensitized-reactions mechanism.