Diphenylglyoxal bis(2-hydroxybenzoylhydrazone) forms an orange-yellow complex with titanium(IV) in weakly acid solution. This complex can be extracted into benzyl alcohol in 0.1 N sulfuric acid medium. In this solvent the extracted complex exhibits an absorption maximum at 500 nm with a molar absorptivity of 1.5 × 104M-1cm-1. Job's method and the molar ratio method indicate a 1:3 stoichiometric ratio. The interferences have been investigated and the reagent has been used successfully for the determination of titanium in minerals and alloys. © 1980.
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