Extraction and spectrophotometric determination of titanium(IV)

Abstract

An extraction-spectrophotometric procedure for the determination of titanium(IV), based on the formation of a Ti-N-4-chlorophenyl-3,4,5-trimethoxycinnamohydroxamic acid (Ti-PTCHA) chelate that is extractable into chloroform from strongly acidic media, is described. The complex exhibits maximum absorbance at 380 nm with a molar absorptivity of 1.7 × 10⁴ l mol^–1 cm^–1. A comparison of the sensitivity of several synthesised hydroxamic acids with an extraction-photometric determination of titanium(IV) has been made. Various parameters for optimising the extraction conditions including the effect of thiocyanate are discussed.