EXTRACTION AND SPECTROPHOTOMETRIC DETERMINATION OF TITANIUM(IV) WITH N-1-HYDROXY-N-1, N-2-DIPHENYLBENZAMIDINE AND THIOCYANATE

A precise, reliable, sensitive, and selective method for the determina tion of titanium(IV) is described. Titanium(IV) reacts with N-1-hydrox y-N-1, N-2-diphenylbenzamidine (HDPBA) and thiocyanate to form an oran ge-coloured mixed-ligand complex of stoichiometry 1:1:2 (Ti: SCN-: HDP BA). The complex is quantitatively extractable into toluene from 0.05- 0.15 M hydrochloric acid. The spectrum of the complex exhibits an abso rption maximum at 400 nm with a molar absorptivity of 20000 M(-1) cm(- 1) and the coloured system obeys Beer's law in the concentration range 0.20-3.0 mu g ml(-1) titanium. The effects of foreign ions and of var ious experimental parameters have been studied to establish the optimu m conditions for the extraction and determination of titanium. The pre cision of the method has been evaluated and the relative standard devi ation has been found to be 0.53%. The method has been successfully app lied to the determination of titanium in synthetic matrices correspond ing to titanium-containing ores, minerals, and alloys.