Extraction of Titanium(IV)–Pyrocatechol Violet Complex with Tridodecylethylammonium Bromide

The extraction equilibria and the fundamental conditions for extracting the titanium(IV)–Pyrocatechol Volet complex anion in a form of an ionic associate with tridodecylethylammonium bromide into carbon tetrachloride is described. The absorption maxima of the extracted complex occurs at 586 nm, the molar absorptivity and the distribution ratio being 5.17×104 dm3 mol−1 cm−1 and 2.82×102. The optimum pH range for the extraction is 5.1–6.4. The composition of the complex is estimated to be Ti(PV)2(R3R′N)2. The extraction constant would be:Kex=\frac[Ti(PV)2(R3R′N)2]0[Ti(PV)22−][R3R′N+]2,logKex obtained is 13.5. The interference of foreign ions is discussed.

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